ISO 27001 Certificate
SOC 1 Type I Certificate
SOC 2 Type II Certificate
PCI DSS
HIPAA
RGPD
Internal validation & live display
Multiple badges & continuous verification
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ISOSOC2 Type 1SOC2 Type 2PCI DSSHIPAAGDPR

Yahoo serves as a trusted guide for hundreds of millions of people globally, helping them achieve their goals online through our portfolio of iconic products. To learn more about Yahoo, please visit yahooinc.com.

Yahoo A.I CyberSecurity Scoring

Yahoo

Company Details

Linkedin ID:

yahoo

Employees number:

9,513

Number of followers:

743,118

NAICS:

5112

Industry Type:

Software Development

Homepage:

yahooinc.com

IP Addresses:

0

Company ID:

YAH_4801788

Scan Status:

In-progress

AI scoreYahoo Risk Score (AI oriented)

Between 700 and 749

https://images.rankiteo.com/companyimages/yahoo.jpeg
Yahoo Software Development
Updated:
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globalscoreYahoo Global Score (TPRM)

XXXX

https://images.rankiteo.com/companyimages/yahoo.jpeg
Yahoo Software Development
  • Instant access to detailed risk factors
  • Benchmark vs. industry & size peers
  • Vulnerabilities
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Yahoo Company CyberSecurity News & History

Past Incidents
9
Attack Types
1
EntityTypeSeverityImpactSeenBlog DetailsIncident DetailsView
Leak ZoneBreach8547/2025
Rankiteo Explanation :
Attack with significant impact with customers data leaks

Description: An unprotected Elasticsearch instance belonging to Leak Zone, an underground forum for cybercriminals, exposed millions of IP addresses and login timestamps of its users. The database, containing over 22 million records, was accessible to anyone, potentially revealing user identities to security researchers, rival criminals, and law enforcement. The exposure included real-time updates and indications of anonymization tool usage. The cause of the exposure remains unknown but is likely due to human error, such as unsecured configurations. The incident highlights the persistent issue of exposed databases leading to significant data leaks.

YahooBreach60402/2017
Rankiteo Explanation :
Attack with significant impact with customers data leaks

Description: Yahoo suffered from a cyber-attack incident that technically tricked cookies into users' logging account passwords. Yahoo investigated the incident and asked those affected by the attack to log into their accounts without passwords.

Yahoo! Inc.Breach8546/2014
Rankiteo Explanation :
Attack with significant impact with customers data leaks

Description: The California Office of the Attorney General reported a data breach involving Yahoo! Inc. on September 22, 2016. A copy of user account information, potentially affecting at least 500 million accounts, was stolen in late 2014 by what Yahoo believes to be a state-sponsored actor. The stolen information may have included names, email addresses, telephone numbers, dates of birth, and hashed passwords, but did not include unprotected passwords, payment card data, or bank account information.

YahooBreach10056/2013
Rankiteo Explanation :
Attack threatening the organization's existence

Description: The **Yahoo mega-breach** remains one of the most devastating cybersecurity incidents in history, occurring between **2013 and 2014** but disclosed in **2016**. Hackers, linked to a state-sponsored group, compromised **all 3 billion Yahoo user accounts**, exposing **names, email addresses, phone numbers, hashed passwords, and security questions/answers**. The breach was executed via **spear-phishing emails** targeting employees, granting attackers access to Yahoo’s internal systems. The fallout was catastrophic: **Verizon lowered its acquisition price of Yahoo by $350 million**, and the company faced **regulatory fines, lawsuits, and irreparable reputational damage**. The stolen data was later found for sale on the dark web, enabling **identity theft, fraud, and targeted phishing campaigns** against users globally. The breach highlighted Yahoo’s **negligent security practices**, including failure to encrypt sensitive data adequately and delayed disclosure, which worsened the impact. The incident remains a benchmark for **corporate data breach consequences**, demonstrating how **mass-scale personal data exposure** can cripple even a tech giant.

YahooBreach100503/2017
Rankiteo Explanation :
Attack threatening the organization’s existence

Description: An unauthorised third party gained access to the company's secret code to learn how to fake specific cookies, which allowed the intrusive party to have unrestricted access to almost 32 million user accounts. The compromised information included names, email addresses, telephone numbers, hashed passwords, dates of birth, and, in some cases, encrypted or unencrypted security questions and answers, but payment and bank information remained safe.

YahooBreach100510/2014
Rankiteo Explanation :
Attack threatening the organization’s existence

Description: A former Yahoo executive claims that between one billion and three billion user accounts could have been impacted by the Yahoo data hack. The Yahoo data breach, according to the experts from the intelligence firm InfoArmor that looked into the event, is the consequence of a cyberattack carried out by cybercriminals who later sold the Yahoo user accounts to a nation-state actor from Eastern Europe. InfoArmor experts verified that the initial hacker to offer the massive data dump for sale is a threat actor going by the handle tessa88; he served as a go-between for the real criminals. A former Yahoo executive, speaking anonymously, claims that the Yahoo architecture collects all user authentication data into a single database.

YahooBreach10012/2016
Rankiteo Explanation :
Attack threatening the organization's existence

Description: Hackers breached Yahoo's networks and gained access to one billion user accounts, which included phone numbers, addresses, and easily cracked hashed passwords. The released data also included certain encrypted and cleartext security questions and answers that had also been compromised. The passwords were secured with the easily cracked MD5 hashing method. According to more information about the incident, the hacker sold the enormous data collection on the Dark Web. Unfortunately, the hacker was paid by at least three distinct buyers two of whom were prominent spammers to obtain the complete information, which they most certainly intended to exploit for espionage purposes.

YahooBreach100401/2014
Rankiteo Explanation :
Attack with significant impact with customers data leaks

Description: Some of the user accounts of Telecom’s YahooXtrahas had their details compromised, following a security breach, which apparently affected non-Telecom customers as well. Apparently, Yahoo acknowledged an email security breach that compromised some YahooXtra email accounts.

Yahoo! Inc.Breach8548/2013
Rankiteo Explanation :
Attack with significant impact with customers data leaks

Description: In December 2016, the California Office of the Attorney General disclosed a massive data breach affecting **Yahoo! Inc.**, originating from an August 2013 cyberattack. A third party claimed possession of stolen user data from over **one billion accounts**, marking one of the largest breaches in history. The compromised information included **names, email addresses, phone numbers, and hashed passwords**, though payment card and bank account details were reportedly not exposed. The breach, attributed to state-sponsored actors, highlighted severe vulnerabilities in Yahoo’s security infrastructure, eroding user trust and leading to significant reputational damage. The incident also triggered regulatory scrutiny, financial penalties, and a **$350 million reduction in Yahoo’s acquisition price by Verizon** due to the breach’s scale and delayed disclosure. While no direct financial fraud was tied to the stolen data, the exposure of personal credentials posed long-term risks, including phishing, identity theft, and account takeovers across other platforms where users reused passwords.

Leak Zone
Breach
Severity: 85
Impact: 4
Seen: 7/2025
Blog:
Rankiteo Explanation
Attack with significant impact with customers data leaks

Description: An unprotected Elasticsearch instance belonging to Leak Zone, an underground forum for cybercriminals, exposed millions of IP addresses and login timestamps of its users. The database, containing over 22 million records, was accessible to anyone, potentially revealing user identities to security researchers, rival criminals, and law enforcement. The exposure included real-time updates and indications of anonymization tool usage. The cause of the exposure remains unknown but is likely due to human error, such as unsecured configurations. The incident highlights the persistent issue of exposed databases leading to significant data leaks.

Yahoo
Breach
Severity: 60
Impact: 4
Seen: 02/2017
Blog:
Rankiteo Explanation
Attack with significant impact with customers data leaks

Description: Yahoo suffered from a cyber-attack incident that technically tricked cookies into users' logging account passwords. Yahoo investigated the incident and asked those affected by the attack to log into their accounts without passwords.

Yahoo! Inc.
Breach
Severity: 85
Impact: 4
Seen: 6/2014
Blog:
Rankiteo Explanation
Attack with significant impact with customers data leaks

Description: The California Office of the Attorney General reported a data breach involving Yahoo! Inc. on September 22, 2016. A copy of user account information, potentially affecting at least 500 million accounts, was stolen in late 2014 by what Yahoo believes to be a state-sponsored actor. The stolen information may have included names, email addresses, telephone numbers, dates of birth, and hashed passwords, but did not include unprotected passwords, payment card data, or bank account information.

Yahoo
Breach
Severity: 100
Impact: 5
Seen: 6/2013
Blog:
Rankiteo Explanation
Attack threatening the organization's existence

Description: The **Yahoo mega-breach** remains one of the most devastating cybersecurity incidents in history, occurring between **2013 and 2014** but disclosed in **2016**. Hackers, linked to a state-sponsored group, compromised **all 3 billion Yahoo user accounts**, exposing **names, email addresses, phone numbers, hashed passwords, and security questions/answers**. The breach was executed via **spear-phishing emails** targeting employees, granting attackers access to Yahoo’s internal systems. The fallout was catastrophic: **Verizon lowered its acquisition price of Yahoo by $350 million**, and the company faced **regulatory fines, lawsuits, and irreparable reputational damage**. The stolen data was later found for sale on the dark web, enabling **identity theft, fraud, and targeted phishing campaigns** against users globally. The breach highlighted Yahoo’s **negligent security practices**, including failure to encrypt sensitive data adequately and delayed disclosure, which worsened the impact. The incident remains a benchmark for **corporate data breach consequences**, demonstrating how **mass-scale personal data exposure** can cripple even a tech giant.

Yahoo
Breach
Severity: 100
Impact: 5
Seen: 03/2017
Blog:
Rankiteo Explanation
Attack threatening the organization’s existence

Description: An unauthorised third party gained access to the company's secret code to learn how to fake specific cookies, which allowed the intrusive party to have unrestricted access to almost 32 million user accounts. The compromised information included names, email addresses, telephone numbers, hashed passwords, dates of birth, and, in some cases, encrypted or unencrypted security questions and answers, but payment and bank information remained safe.

Yahoo
Breach
Severity: 100
Impact: 5
Seen: 10/2014
Blog:
Rankiteo Explanation
Attack threatening the organization’s existence

Description: A former Yahoo executive claims that between one billion and three billion user accounts could have been impacted by the Yahoo data hack. The Yahoo data breach, according to the experts from the intelligence firm InfoArmor that looked into the event, is the consequence of a cyberattack carried out by cybercriminals who later sold the Yahoo user accounts to a nation-state actor from Eastern Europe. InfoArmor experts verified that the initial hacker to offer the massive data dump for sale is a threat actor going by the handle tessa88; he served as a go-between for the real criminals. A former Yahoo executive, speaking anonymously, claims that the Yahoo architecture collects all user authentication data into a single database.

Yahoo
Breach
Severity: 100
Impact:
Seen: 12/2016
Blog:
Rankiteo Explanation
Attack threatening the organization's existence

Description: Hackers breached Yahoo's networks and gained access to one billion user accounts, which included phone numbers, addresses, and easily cracked hashed passwords. The released data also included certain encrypted and cleartext security questions and answers that had also been compromised. The passwords were secured with the easily cracked MD5 hashing method. According to more information about the incident, the hacker sold the enormous data collection on the Dark Web. Unfortunately, the hacker was paid by at least three distinct buyers two of whom were prominent spammers to obtain the complete information, which they most certainly intended to exploit for espionage purposes.

Yahoo
Breach
Severity: 100
Impact: 4
Seen: 01/2014
Blog:
Rankiteo Explanation
Attack with significant impact with customers data leaks

Description: Some of the user accounts of Telecom’s YahooXtrahas had their details compromised, following a security breach, which apparently affected non-Telecom customers as well. Apparently, Yahoo acknowledged an email security breach that compromised some YahooXtra email accounts.

Yahoo! Inc.
Breach
Severity: 85
Impact: 4
Seen: 8/2013
Blog:
Rankiteo Explanation
Attack with significant impact with customers data leaks

Description: In December 2016, the California Office of the Attorney General disclosed a massive data breach affecting **Yahoo! Inc.**, originating from an August 2013 cyberattack. A third party claimed possession of stolen user data from over **one billion accounts**, marking one of the largest breaches in history. The compromised information included **names, email addresses, phone numbers, and hashed passwords**, though payment card and bank account details were reportedly not exposed. The breach, attributed to state-sponsored actors, highlighted severe vulnerabilities in Yahoo’s security infrastructure, eroding user trust and leading to significant reputational damage. The incident also triggered regulatory scrutiny, financial penalties, and a **$350 million reduction in Yahoo’s acquisition price by Verizon** due to the breach’s scale and delayed disclosure. While no direct financial fraud was tied to the stolen data, the exposure of personal credentials posed long-term risks, including phishing, identity theft, and account takeovers across other platforms where users reused passwords.

Ailogo

Yahoo Company Scoring based on AI Models

Cyber Incidents Likelihood 3 - 6 - 9 months

🔒
Incident Predictions locked
Access Monitoring Plan

A.I Risk Score Likelihood 3 - 6 - 9 months

🔒
A.I. Risk Score Predictions locked
Access Monitoring Plan
statics

Underwriter Stats for Yahoo

Incidents vs Software Development Industry Average (This Year)

No incidents recorded for Yahoo in 2025.

Incidents vs All-Companies Average (This Year)

No incidents recorded for Yahoo in 2025.

Incident Types Yahoo vs Software Development Industry Avg (This Year)

No incidents recorded for Yahoo in 2025.

Incident History — Yahoo (X = Date, Y = Severity)

Yahoo cyber incidents detection timeline including parent company and subsidiaries

Yahoo Company Subsidiaries

SubsidiaryImage

Yahoo serves as a trusted guide for hundreds of millions of people globally, helping them achieve their goals online through our portfolio of iconic products. To learn more about Yahoo, please visit yahooinc.com.

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faq

Frequently Asked Questions

Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.

Yahoo CyberSecurity History Information

Official Website of Yahoo

The official website of Yahoo is http://www.yahooinc.com.

Yahoo’s AI-Generated Cybersecurity Score

According to Rankiteo, Yahoo’s AI-generated cybersecurity score is 742, reflecting their Moderate security posture.

How many security badges does Yahoo’ have ?

According to Rankiteo, Yahoo currently holds 0 security badges, indicating that no recognized compliance certifications are currently verified for the organization.

Does Yahoo have SOC 2 Type 1 certification ?

According to Rankiteo, Yahoo is not certified under SOC 2 Type 1.

Does Yahoo have SOC 2 Type 2 certification ?

According to Rankiteo, Yahoo does not hold a SOC 2 Type 2 certification.

Does Yahoo comply with GDPR ?

According to Rankiteo, Yahoo is not listed as GDPR compliant.

Does Yahoo have PCI DSS certification ?

According to Rankiteo, Yahoo does not currently maintain PCI DSS compliance.

Does Yahoo comply with HIPAA ?

According to Rankiteo, Yahoo is not compliant with HIPAA regulations.

Does Yahoo have ISO 27001 certification ?

According to Rankiteo,Yahoo is not certified under ISO 27001, indicating the absence of a formally recognized information security management framework.

Industry Classification of Yahoo

Yahoo operates primarily in the Software Development industry.

Number of Employees at Yahoo

Yahoo employs approximately 9,513 people worldwide.

Subsidiaries Owned by Yahoo

Yahoo presently has no subsidiaries across any sectors.

Yahoo’s LinkedIn Followers

Yahoo’s official LinkedIn profile has approximately 743,118 followers.

NAICS Classification of Yahoo

Yahoo is classified under the NAICS code 5112, which corresponds to Software Publishers.

Yahoo’s Presence on Crunchbase

No, Yahoo does not have a profile on Crunchbase.

Yahoo’s Presence on LinkedIn

Yes, Yahoo maintains an official LinkedIn profile, which is actively utilized for branding and talent engagement, which can be accessed here: https://www.linkedin.com/company/yahoo.

Cybersecurity Incidents Involving Yahoo

As of December 17, 2025, Rankiteo reports that Yahoo has experienced 9 cybersecurity incidents.

Number of Peer and Competitor Companies

Yahoo has an estimated 27,790 peer or competitor companies worldwide.

What types of cybersecurity incidents have occurred at Yahoo ?

Incident Types: The types of cybersecurity incidents that have occurred include Breach.

What was the total financial impact of these incidents on Yahoo ?

Total Financial Loss: The total financial loss from these incidents is estimated to be $16.60 billion.

How does Yahoo detect and respond to cybersecurity incidents ?

Detection and Response: The company detects and responds to cybersecurity incidents through an communication strategy with yahoo asked affected users to log into their accounts without passwords., and containment measures with database locked down, and law enforcement notified with yes (california office of the attorney general), and third party assistance with fbi ic3, third party assistance with vpnmentor research team, and law enforcement notified with yes (fbi ic3 complaints), and communication strategy with vpnmentor blog post, communication strategy with public advisories, and enhanced monitoring with recommended (proactive defense strategies)..

Incident Details

Can you provide details on each incident ?

Incident : Cyber Attack

Title: Yahoo Cyber Attack Incident

Description: Yahoo suffered from a cyber-attack incident that technically tricked cookies into users' logging account passwords. Yahoo investigated the incident and asked those affected by the attack to log into their accounts without passwords.

Type: Cyber Attack

Attack Vector: Cookie Manipulation

Vulnerability Exploited: Web Application Vulnerability

Incident : Data Breach

Title: Unauthorized Access to User Accounts

Description: An unauthorised third party gained access to the company's secret code to learn how to fake specific cookies, which allowed the intrusive party to have unrestricted access to almost 32 million user accounts. The compromised information included names, email addresses, telephone numbers, hashed passwords, dates of birth, and, in some cases, encrypted or unencrypted security questions and answers, but payment and bank information remained safe.

Type: Data Breach

Attack Vector: Cookie Manipulation

Vulnerability Exploited: Stolen secret code for cookie generation

Incident : Data Breach

Title: YahooXtra Email Security Breach

Description: Some of the user accounts of Telecom’s YahooXtrahad their details compromised, following a security breach, which apparently affected non-Telecom customers as well. Yahoo acknowledged an email security breach that compromised some YahooXtra email accounts.

Type: Data Breach

Incident : Data Breach

Title: Yahoo Data Breach

Description: A former Yahoo executive claims that between one billion and three billion user accounts could have been impacted by the Yahoo data hack. The Yahoo data breach, according to the experts from the intelligence firm InfoArmor that looked into the event, is the consequence of a cyberattack carried out by cybercriminals who later sold the Yahoo user accounts to a nation-state actor from Eastern Europe. InfoArmor experts verified that the initial hacker to offer the massive data dump for sale is a threat actor going by the handle tessa88; he served as a go-between for the real criminals. A former Yahoo executive, speaking anonymously, claims that the Yahoo architecture collects all user authentication data into a single database.

Type: Data Breach

Threat Actor: tessa88nation-state actor from Eastern Europe

Motivation: Financial gain and espionage

Incident : Data Breach

Title: Yahoo Data Breach

Description: Hackers breached Yahoo's networks and gained access to one billion user accounts, which included phone numbers, addresses, and easily cracked hashed passwords. The released data also included certain encrypted and cleartext security questions and answers that had also been compromised. The passwords were secured with the easily cracked MD5 hashing method. The hacker sold the enormous data collection on the Dark Web. Unfortunately, the hacker was paid by at least three distinct buyers two of whom were prominent spammers to obtain the complete information, which they most certainly intended to exploit for espionage purposes.

Type: Data Breach

Attack Vector: Network Breach

Threat Actor: Hackers

Motivation: Espionage

Incident : Data Breach

Title: Yahoo! Inc. Data Breach

Description: A data breach involving Yahoo! Inc. was reported by the California Office of the Attorney General on September 22, 2016. A copy of user account information, potentially affecting at least 500 million accounts, was stolen in late 2014 by what Yahoo believes to be a state-sponsored actor. The stolen information may have included names, email addresses, telephone numbers, dates of birth, and hashed passwords, but did not include unprotected passwords, payment card data, or bank account information.

Date Detected: 2016-09-22

Date Publicly Disclosed: 2016-09-22

Type: Data Breach

Attack Vector: State-sponsored actor

Threat Actor: State-sponsored actor

Incident : Data Leak

Title: Exposed Elasticsearch Instance Belonging to Leak Zone

Description: An unprotected Elasticsearch instance belonging to Leak Zone, an underground forum, exposed millions of IP addresses of its users. The database contained over 22 million records, including IP addresses and login timestamps, potentially revealing user identities to security researchers, rival criminals, and law enforcement.

Type: Data Leak

Vulnerability Exploited: Exposed Elasticsearch Database

Incident : Data Breach

Title: Yahoo Data Breach (2013, Disclosed 2016)

Description: On December 14, 2016, the California Office of the Attorney General reported data security issues concerning Yahoo! Inc. A third party claimed to have Yahoo user data that was stolen in August 2013, affecting over one billion user accounts. The compromised information may have included names, email addresses, phone numbers, and hashed passwords, but not payment card or bank account data.

Date Detected: 2016-12-14

Date Publicly Disclosed: 2016-12-14

Type: Data Breach

Incident : cybercrime trend analysis

Title: 25-Year Analysis of Global Cybercrime Trends and Financial Impact (1999–2024)

Description: Researchers from vpnMentor analyzed 25 years of FBI IC3 data and major global cyber incidents, revealing a 51-fold increase in complaints (from 16,838 in 2000 to 859,532 in 2024) and a record $16.6 billion in losses in 2024 (up 32.8% from 2023). Investment scams ($6.6B) and ransomware ($6B+) dominated corporate losses, while seniors suffered the highest individual financial harm ($4.8B). The analysis highlights evolving cybercriminal tactics, including AI-driven threats, and underscores the need for adaptive defense strategies.

Date Publicly Disclosed: 2024-07-00

Type: cybercrime trend analysis

Attack Vector: phishingsocial engineeringexploiting vulnerabilitiesransomware deploymentAI-driven scams

Threat Actor: cybercriminal syndicatesinvestment scammersransomware groupselder fraud actors

Motivation: financial gaindata theftfraudextortion

What are the most common types of attacks the company has faced ?

Common Attack Types: The most common types of attacks the company has faced is Breach.

How does the company identify the attack vectors used in incidents ?

Identification of Attack Vectors: The company identifies the attack vectors used in incidents through phishing emailsvulnerable cloud storage (e.g. and Capital One)third-party breaches.

Impact of the Incidents

What was the impact of each incident ?

Incident : Data Breach YAH1236722

Data Compromised: Names, Email addresses, Telephone numbers, Hashed passwords, Dates of birth, Encrypted or unencrypted security questions and answers

Incident : Data Breach YAH228141222

Data Compromised: Email account details

Incident : Data Breach YAH203551123

Data Compromised: User authentication data

Incident : Data Breach YAH35131123

Data Compromised: Phone numbers, Addresses, Hashed passwords, Security questions and answers

Incident : Data Breach YAH012072925

Data Compromised: Names, Email addresses, Telephone numbers, Dates of birth, Hashed passwords

Incident : Data Leak TEC853080725

Data Compromised: IP addresses and login timestamps

Systems Affected: Elasticsearch Database

Brand Reputation Impact: High (Underground forum users exposed)

Identity Theft Risk: High

Incident : Data Breach YAH948091725

Data Compromised: Names, Email addresses, Phone numbers, Hashed passwords

Brand Reputation Impact: Severe (affected over 1 billion accounts)

Identity Theft Risk: High (PII exposed)

Payment Information Risk: None (payment card/bank data not compromised)

Incident : cybercrime trend analysis YAH5493654101325

Financial Loss: $16.6 billion (2024 IC3 losses) + $128 billion (1988–2025 corporate incidents)

Data Compromised: 35+ major data breaches (e.g., Yahoo, Equifax, Target, Capital One)

Revenue Loss: $6B+ (ransomware) + $6.6B (investment scams)

Customer Complaints: 859,532 (2024 IC3 complaints)

Brand Reputation Impact: High (notable breaches like Yahoo, Equifax)

Identity Theft Risk: High (data breaches exposed PII)

Payment Information Risk: High (e.g., Capital One cloud breach)

What is the average financial loss per incident ?

Average Financial Loss: The average financial loss per incident is $1.84 billion.

What types of data are most commonly compromised in incidents ?

Commonly Compromised Data Types: The types of data most commonly compromised in incidents are Names, Email Addresses, Telephone Numbers, Hashed Passwords, Dates Of Birth, Encrypted Or Unencrypted Security Questions And Answers, , Email Account Details, , User Authentication Data, , Phone Numbers, Addresses, Hashed Passwords, Security Questions And Answers, , Names, Email Addresses, Telephone Numbers, Dates Of Birth, Hashed Passwords, , IP addresses, login timestamps, Personally Identifiable Information (Pii), Authentication Data, , Personally Identifiable Information (Pii), Payment Card Data, Credit Reports, Cloud-Stored Data and .

Which entities were affected by each incident ?

Incident : Cyber Attack YAH11136722

Entity Name: Yahoo

Entity Type: Company

Industry: Technology

Location: Global

Incident : Data Breach YAH1236722

Customers Affected: 32 million

Incident : Data Breach YAH228141222

Entity Name: YahooXtra

Entity Type: Email Service Provider

Industry: Telecommunications

Incident : Data Breach YAH203551123

Entity Name: Yahoo

Entity Type: Company

Industry: Technology

Customers Affected: one billion to three billion

Incident : Data Breach YAH35131123

Entity Name: Yahoo

Entity Type: Company

Industry: Technology

Location: Global

Size: Large

Customers Affected: One billion

Incident : Data Breach YAH012072925

Entity Name: Yahoo! Inc.

Entity Type: Company

Industry: Technology

Customers Affected: 500 million

Incident : Data Leak TEC853080725

Entity Name: Leak Zone

Entity Type: Underground Forum

Industry: Cybercrime

Size: Approximately 100,000 members

Customers Affected: 100,000 members

Incident : Data Breach YAH948091725

Entity Name: Yahoo! Inc.

Entity Type: Corporation

Industry: Technology (Internet Services)

Location: Sunnyvale, California, USA

Size: Large (global operations)

Customers Affected: 1,000,000,000+

Incident : cybercrime trend analysis YAH5493654101325

Entity Name: U.S. General Public

Entity Type: individuals

Location: United States

Size: 859,532 complaints (2024)

Customers Affected: 1 in 395 U.S. residents

Incident : cybercrime trend analysis YAH5493654101325

Entity Name: Seniors (60+ years)

Entity Type: individuals

Location: United States

Customers Affected: 147,127 complaints

Incident : cybercrime trend analysis YAH5493654101325

Entity Name: Corporations (1988–2025)

Entity Type: organizations

Industry: technology, finance, retail, healthcare

Location: Global

Size: 100 high-profile cases

Incident : cybercrime trend analysis YAH5493654101325

Entity Name: Yahoo

Entity Type: organization

Industry: technology

Location: Global

Customers Affected: 3 billion (mega-breach)

Incident : cybercrime trend analysis YAH5493654101325

Entity Name: Equifax

Entity Type: organization

Industry: finance/credit reporting

Location: United States

Customers Affected: 147 million

Incident : cybercrime trend analysis YAH5493654101325

Entity Name: Target

Entity Type: organization

Industry: retail

Location: United States

Customers Affected: 41 million

Incident : cybercrime trend analysis YAH5493654101325

Entity Name: Capital One

Entity Type: organization

Industry: finance

Location: United States

Customers Affected: 106 million

Response to the Incidents

What measures were taken in response to each incident ?

Incident : Cyber Attack YAH11136722

Communication Strategy: Yahoo asked affected users to log into their accounts without passwords.

Incident : Data Leak TEC853080725

Containment Measures: Database locked down

Incident : Data Breach YAH948091725

Law Enforcement Notified: Yes (California Office of the Attorney General)

Incident : cybercrime trend analysis YAH5493654101325

Third Party Assistance: Fbi Ic3, Vpnmentor Research Team.

Law Enforcement Notified: Yes (FBI IC3 complaints)

Communication Strategy: vpnMentor blog postpublic advisories

Enhanced Monitoring: Recommended (proactive defense strategies)

How does the company involve third-party assistance in incident response ?

Third-Party Assistance: The company involves third-party assistance in incident response through FBI IC3, vpnMentor research team, .

Data Breach Information

What type of data was compromised in each breach ?

Incident : Data Breach YAH1236722

Type of Data Compromised: Names, Email addresses, Telephone numbers, Hashed passwords, Dates of birth, Encrypted or unencrypted security questions and answers

Number of Records Exposed: 32 million

Incident : Data Breach YAH228141222

Type of Data Compromised: Email account details

Incident : Data Breach YAH203551123

Type of Data Compromised: User authentication data

Number of Records Exposed: one billion to three billion

Incident : Data Breach YAH35131123

Type of Data Compromised: Phone numbers, Addresses, Hashed passwords, Security questions and answers

Number of Records Exposed: One billion

Sensitivity of Data: High

Data Exfiltration: Yes

Data Encryption: MD5 hashing

Personally Identifiable Information: Yes

Incident : Data Breach YAH012072925

Type of Data Compromised: Names, Email addresses, Telephone numbers, Dates of birth, Hashed passwords

Number of Records Exposed: 500 million

Personally Identifiable Information: namesemail addressestelephone numbersdates of birth

Incident : Data Leak TEC853080725

Type of Data Compromised: IP addresses, login timestamps

Number of Records Exposed: 22 million

Sensitivity of Data: High

Data Encryption: None

Personally Identifiable Information: IP addresses

Incident : Data Breach YAH948091725

Type of Data Compromised: Personally identifiable information (pii), Authentication data

Number of Records Exposed: 1,000,000,000+

Sensitivity of Data: High (includes hashed passwords)

Data Exfiltration: Yes

Data Encryption: Partially (hashed passwords)

Personally Identifiable Information: namesemail addressesphone numbers

Incident : cybercrime trend analysis YAH5493654101325

Type of Data Compromised: Personally identifiable information (pii), Payment card data, Credit reports, Cloud-stored data

Number of Records Exposed: Billions (e.g., Yahoo: 3B, Equifax: 147M)

Sensitivity of Data: High (PII, financial data)

Data Exfiltration: Yes (e.g., Capital One cloud breach)

Personally Identifiable Information: Yes (names, SSNs, addresses, etc.)

How does the company handle incidents involving personally identifiable information (PII) ?

Handling of PII Incidents: The company handles incidents involving personally identifiable information (PII) through by database locked down.

Ransomware Information

Was ransomware involved in any of the incidents ?

Incident : cybercrime trend analysis YAH5493654101325

Data Encryption: Yes (corporate ransomware attacks)

Data Exfiltration: Yes (double extortion tactics)

Regulatory Compliance

Were there any regulatory violations and fines imposed for each incident ?

Incident : Data Breach YAH948091725

Regulatory Notifications: California Office of the Attorney General

Lessons Learned and Recommendations

What lessons were learned from each incident ?

Incident : Data Leak TEC853080725

Lessons Learned: Exposed databases continue to be a leading cause of data leaks, often due to human error such as forgetting to set passwords or encrypt data. Cloud security operates on a shared responsibility model, which many IT teams may not fully understand.

Incident : cybercrime trend analysis YAH5493654101325

Lessons Learned: Cybercrime costs have grown exponentially (51x complaints, 2,477x financial losses since 2000)., Seniors and investment scam victims suffer disproportionate financial harm., Ransomware and data breaches dominate corporate losses ($6B+ and $128B respectively)., AI and evolving tactics require adaptive, proactive cybersecurity strategies., Public-private collaboration (e.g., FBI IC3) is critical for trend analysis and mitigation.

What recommendations were made to prevent future incidents ?

Incident : Data Leak TEC853080725

Recommendations: Ensure proper security measures are in place for cloud databases, including password protection and encryption. Educate IT teams on the shared responsibility model for cloud security.

Incident : cybercrime trend analysis YAH5493654101325

Recommendations: Enhance elder fraud protections and financial literacy programs., Prioritize ransomware defense (backups, segmentation, EDR)., Invest in AI-driven threat detection to counter AI-powered attacks., Strengthen data breach notifications and victim support systems., Expand corporate cybersecurity budgets to match escalating threats.Enhance elder fraud protections and financial literacy programs., Prioritize ransomware defense (backups, segmentation, EDR)., Invest in AI-driven threat detection to counter AI-powered attacks., Strengthen data breach notifications and victim support systems., Expand corporate cybersecurity budgets to match escalating threats.Enhance elder fraud protections and financial literacy programs., Prioritize ransomware defense (backups, segmentation, EDR)., Invest in AI-driven threat detection to counter AI-powered attacks., Strengthen data breach notifications and victim support systems., Expand corporate cybersecurity budgets to match escalating threats.Enhance elder fraud protections and financial literacy programs., Prioritize ransomware defense (backups, segmentation, EDR)., Invest in AI-driven threat detection to counter AI-powered attacks., Strengthen data breach notifications and victim support systems., Expand corporate cybersecurity budgets to match escalating threats.Enhance elder fraud protections and financial literacy programs., Prioritize ransomware defense (backups, segmentation, EDR)., Invest in AI-driven threat detection to counter AI-powered attacks., Strengthen data breach notifications and victim support systems., Expand corporate cybersecurity budgets to match escalating threats.

What are the key lessons learned from past incidents ?

Key Lessons Learned: The key lessons learned from past incidents are Exposed databases continue to be a leading cause of data leaks, often due to human error such as forgetting to set passwords or encrypt data. Cloud security operates on a shared responsibility model, which many IT teams may not fully understand.Cybercrime costs have grown exponentially (51x complaints, 2,477x financial losses since 2000).,Seniors and investment scam victims suffer disproportionate financial harm.,Ransomware and data breaches dominate corporate losses ($6B+ and $128B respectively).,AI and evolving tactics require adaptive, proactive cybersecurity strategies.,Public-private collaboration (e.g., FBI IC3) is critical for trend analysis and mitigation.

What recommendations has the company implemented to improve cybersecurity ?

Implemented Recommendations: The company has implemented the following recommendations to improve cybersecurity: Invest in AI-driven threat detection to counter AI-powered attacks., Ensure proper security measures are in place for cloud databases, including password protection and encryption. Educate IT teams on the shared responsibility model for cloud security., Strengthen data breach notifications and victim support systems., Enhance elder fraud protections and financial literacy programs., Expand corporate cybersecurity budgets to match escalating threats., Prioritize ransomware defense (backups, segmentation and EDR)..

References

Where can I find more information about each incident ?

Incident : Data Breach YAH012072925

Source: California Office of the Attorney General

Date Accessed: 2016-09-22

Incident : Data Leak TEC853080725

Source: TechCrunch

Incident : Data Breach YAH948091725

Source: California Office of the Attorney General

Date Accessed: 2016-12-14

Incident : cybercrime trend analysis YAH5493654101325

Source: vpnMentor Blog

URL: https://www.vpnmentor.com/blog/

Date Accessed: 2024-07-00

Incident : cybercrime trend analysis YAH5493654101325

Source: FBI Internet Crime Complaint Center (IC3) 2024 Report

URL: https://www.ic3.gov/

Date Accessed: 2024-07-00

Where can stakeholders find additional resources on cybersecurity best practices ?

Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: California Office of the Attorney GeneralDate Accessed: 2016-09-22, and Source: TechCrunch, and Source: California Office of the Attorney GeneralDate Accessed: 2016-12-14, and Source: vpnMentor BlogUrl: https://www.vpnmentor.com/blog/Date Accessed: 2024-07-00, and Source: FBI Internet Crime Complaint Center (IC3) 2024 ReportUrl: https://www.ic3.gov/Date Accessed: 2024-07-00.

Investigation Status

What is the current status of the investigation for each incident ?

Incident : Data Leak TEC853080725

Investigation Status: Resolved (Database locked down)

Incident : cybercrime trend analysis YAH5493654101325

Investigation Status: Completed (trend analysis)

How does the company communicate the status of incident investigations to stakeholders ?

Communication of Investigation Status: The company communicates the status of incident investigations to stakeholders through Yahoo asked affected users to log into their accounts without passwords., Vpnmentor Blog Post and Public Advisories.

Stakeholder and Customer Advisories

Were there any advisories issued to stakeholders or customers for each incident ?

Incident : cybercrime trend analysis YAH5493654101325

Stakeholder Advisories: Vpnmentor Recommendations For Policymakers, Fbi Ic3 Public Alerts.

Customer Advisories: Elder fraud warningsphishing awareness campaigns

What advisories does the company provide to stakeholders and customers following an incident ?

Advisories Provided: The company provides the following advisories to stakeholders and customers following an incident: were Vpnmentor Recommendations For Policymakers, Fbi Ic3 Public Alerts, Elder Fraud Warnings, Phishing Awareness Campaigns and .

Initial Access Broker

How did the initial access broker gain entry for each incident ?

Incident : cybercrime trend analysis YAH5493654101325

Entry Point: Phishing Emails, Vulnerable Cloud Storage (E.G., Capital One), Third-Party Breaches,

High Value Targets: Financial Data, Pii Databases, Corporate Networks,

Data Sold on Dark Web: Financial Data, Pii Databases, Corporate Networks,

Post-Incident Analysis

What were the root causes and corrective actions taken for each incident ?

Incident : Data Leak TEC853080725

Root Causes: Human error (unprotected Elasticsearch instance)

Corrective Actions: Database locked down

Incident : cybercrime trend analysis YAH5493654101325

Root Causes: Underinvestment In Cybersecurity Relative To Threat Growth, Lack Of Adaptive Defenses Against Ai-Driven Attacks, Insufficient Protections For Vulnerable Demographics (E.G., Seniors), Persistent Vulnerabilities In Cloud Storage And Third-Party Systems,

Corrective Actions: Scale Proactive Threat Hunting And Ai-Based Defenses., Mandate Cybersecurity Training For High-Risk Groups., Enforce Stricter Third-Party Vendor Security Assessments., Expand Fbi Ic3 Resources For Complaint Processing And Trend Analysis.,

What is the company's process for conducting post-incident analysis ?

Post-Incident Analysis Process: The company's process for conducting post-incident analysis is described as Fbi Ic3, Vpnmentor Research Team, , Recommended (proactive defense strategies).

What corrective actions has the company taken based on post-incident analysis ?

Corrective Actions Taken: The company has taken the following corrective actions based on post-incident analysis: Database locked down, Scale Proactive Threat Hunting And Ai-Based Defenses., Mandate Cybersecurity Training For High-Risk Groups., Enforce Stricter Third-Party Vendor Security Assessments., Expand Fbi Ic3 Resources For Complaint Processing And Trend Analysis., .

Additional Questions

General Information

Who was the attacking group in the last incident ?

Last Attacking Group: The attacking group in the last incident were an tessa88nation-state actor from Eastern Europe, Hackers, State-sponsored actor and cybercriminal syndicatesinvestment scammersransomware groupselder fraud actors.

Incident Details

What was the most recent incident detected ?

Most Recent Incident Detected: The most recent incident detected was on 2016-09-22.

What was the most recent incident publicly disclosed ?

Most Recent Incident Publicly Disclosed: The most recent incident publicly disclosed was on 2024-07-00.

Impact of the Incidents

What was the highest financial loss from an incident ?

Highest Financial Loss: The highest financial loss from an incident was $16.6 billion (2024 IC3 losses) + $128 billion (1988–2025 corporate incidents).

What was the most significant data compromised in an incident ?

Most Significant Data Compromised: The most significant data compromised in an incident were Names, Email addresses, Telephone numbers, Hashed passwords, Dates of birth, Encrypted or unencrypted security questions and answers, , Email account details, , User authentication data, , phone numbers, addresses, hashed passwords, security questions and answers, , names, email addresses, telephone numbers, dates of birth, hashed passwords, , IP addresses and login timestamps, names, email addresses, phone numbers, hashed passwords, , 35+ major data breaches (e.g., Yahoo, Equifax, Target and Capital One).

Response to the Incidents

What third-party assistance was involved in the most recent incident ?

Third-Party Assistance in Most Recent Incident: The third-party assistance involved in the most recent incident was fbi ic3, vpnmentor research team, .

What containment measures were taken in the most recent incident ?

Containment Measures in Most Recent Incident: The containment measures taken in the most recent incident was Database locked down.

Data Breach Information

What was the most sensitive data compromised in a breach ?

Most Sensitive Data Compromised: The most sensitive data compromised in a breach were Email addresses, security questions and answers, Dates of birth, Hashed passwords, addresses, telephone numbers, Names, Email account details, hashed passwords, email addresses, Telephone numbers, 35+ major data breaches (e.g., Yahoo, Equifax, Target, Capital One), User authentication data, names, dates of birth, Encrypted or unencrypted security questions and answers, IP addresses and login timestamps and phone numbers.

What was the number of records exposed in the most significant breach ?

Number of Records Exposed in Most Significant Breach: The number of records exposed in the most significant breach was 1.6B.

Lessons Learned and Recommendations

What was the most significant lesson learned from past incidents ?

Most Significant Lesson Learned: The most significant lesson learned from past incidents was Public-private collaboration (e.g., FBI IC3) is critical for trend analysis and mitigation.

What was the most significant recommendation implemented to improve cybersecurity ?

Most Significant Recommendation Implemented: The most significant recommendation implemented to improve cybersecurity was Invest in AI-driven threat detection to counter AI-powered attacks., Ensure proper security measures are in place for cloud databases, including password protection and encryption. Educate IT teams on the shared responsibility model for cloud security., Strengthen data breach notifications and victim support systems., Enhance elder fraud protections and financial literacy programs., Expand corporate cybersecurity budgets to match escalating threats., Prioritize ransomware defense (backups, segmentation and EDR)..

References

What is the most recent source of information about an incident ?

Most Recent Source: The most recent source of information about an incident are vpnMentor Blog, FBI Internet Crime Complaint Center (IC3) 2024 Report, California Office of the Attorney General and TechCrunch.

What is the most recent URL for additional resources on cybersecurity best practices ?

Most Recent URL for Additional Resources: The most recent URL for additional resources on cybersecurity best practices is https://www.vpnmentor.com/blog/, https://www.ic3.gov/ .

Investigation Status

What is the current status of the most recent investigation ?

Current Status of Most Recent Investigation: The current status of the most recent investigation is Resolved (Database locked down).

Stakeholder and Customer Advisories

What was the most recent stakeholder advisory issued ?

Most Recent Stakeholder Advisory: The most recent stakeholder advisory issued was vpnMentor recommendations for policymakers, FBI IC3 public alerts, .

What was the most recent customer advisory issued ?

Most Recent Customer Advisory: The most recent customer advisory issued was an Elder fraud warningsphishing awareness campaigns.

Initial Access Broker

Post-Incident Analysis

What was the most significant root cause identified in post-incident analysis ?

Most Significant Root Cause: The most significant root cause identified in post-incident analysis was Human error (unprotected Elasticsearch instance), Underinvestment in cybersecurity relative to threat growthLack of adaptive defenses against AI-driven attacksInsufficient protections for vulnerable demographics (e.g., seniors)Persistent vulnerabilities in cloud storage and third-party systems.

What was the most significant corrective action taken based on post-incident analysis ?

Most Significant Corrective Action: The most significant corrective action taken based on post-incident analysis was Database locked down, Scale proactive threat hunting and AI-based defenses.Mandate cybersecurity training for high-risk groups.Enforce stricter third-party vendor security assessments.Expand FBI IC3 resources for complaint processing and trend analysis..

cve

Latest Global CVEs (Not Company-Specific)

Description

Hitachi Vantara Pentaho Data Integration and Analytics Community Dashboard Framework prior to versions 10.2.0.4, including 9.3.0.x and 8.3.x display the full server stack trace when encountering an error within the GetCdfResource servlet.

Risk Information
cvss3
Base: 5.3
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Description

Pentaho Data Integration and Analytics Community Dashboard Editor plugin versions before 10.2.0.4, including 9.3.0.x and 8.3.x, deserialize untrusted JSON data without constraining the parser to approved classes and methods.

Risk Information
cvss3
Base: 8.8
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Description

A security flaw has been discovered in CTCMS Content Management System up to 2.1.2. The impacted element is an unknown function in the library /ctcms/libs/Ct_Config.php of the component Backend System Configuration Module. The manipulation of the argument Cj_Add/Cj_Edit results in code injection. The attack can be executed remotely. The exploit has been released to the public and may be exploited.

Risk Information
cvss2
Base: 5.8
Severity: LOW
AV:N/AC:L/Au:M/C:P/I:P/A:P
cvss3
Base: 4.7
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
cvss4
Base: 5.1
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Description

A vulnerability was identified in CTCMS Content Management System up to 2.1.2. The affected element is the function Save of the file /ctcms/libs/Ct_App.php of the component Backend App Configuration Module. The manipulation of the argument CT_App_Paytype leads to code injection. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.

Risk Information
cvss2
Base: 5.8
Severity: LOW
AV:N/AC:L/Au:M/C:P/I:P/A:P
cvss3
Base: 4.7
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
cvss4
Base: 5.1
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Description

Weblate is a web based localization tool. In versions prior to 5.15, it was possible to accept an invitation opened by a different user. Version 5.15. contains a patch. As a workaround, avoid leaving one's Weblate sessions with an invitation opened unattended.

Risk Information
cvss4
Base: 1.0
Severity: HIGH
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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Every week, Rankiteo analyzes billions of signals to give organizations a sharper, faster view of emerging risks. With deeper, more actionable intelligence at their fingertips, security teams can outpace threat actors, respond instantly to Zero-Day attacks, and dramatically shrink their risk exposure window.

These are some of the factors we use to calculate the overall score:

Network Security

Identify exposed access points, detect misconfigured SSL certificates, and uncover vulnerabilities across the network infrastructure.

SBOM (Software Bill of Materials)

Gain visibility into the software components used within an organization to detect vulnerabilities, manage risk, and ensure supply chain security.

CMDB (Configuration Management Database)

Monitor and manage all IT assets and their configurations to ensure accurate, real-time visibility across the company's technology environment.

Threat Intelligence

Leverage real-time insights on active threats, malware campaigns, and emerging vulnerabilities to proactively defend against evolving cyberattacks.

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