Yahoo Company Cyber Security Posture
yahooinc.comYahoo serves as a trusted guide for hundreds of millions of people globally, helping them achieve their goals online through our portfolio of iconic products. For advertisers, Yahoo Advertising offers omnichannel solutions and powerful data to engage with our brands and deliver results. To learn more about Yahoo, please visit yahooinc.com.
Yahoo Company Details
yahoo
10497 employees
724260.0
511
Software Development
yahooinc.com
Scan still pending
YAH_4801788
In-progress
Yahoo Risk Score (AI oriented)Between 900 and 1000
This score is AI-generated and less favored by cyber insurers, who prefer the TPRM score.
Yahoo Global Score.png)
Yahoo Company Scoring based on AI Models
| Model Name | Date | Description | Current Score Difference | Score |
|---|---|---|---|---|
| AVERAGE-Industry | 03-12-2025 | This score represents the average cybersecurity rating of companies already scanned within the same industry. It provides a benchmark to compare an individual company's security posture against its industry peers. | N/A | Between 900 and 1000 |
Yahoo Company Cyber Security News & History
| Entity | Type | Severity | Impact | Seen | Url ID | Details | View |
|---|---|---|---|---|---|---|---|
| Yahoo | Breach | 60 | 4 | 02/2017 | YAH11136722 | Link | |
Rankiteo Explanation : Attack with significant impact with customers data leaksDescription: 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 | Breach | 100 | 5 | 03/2017 | YAH1236722 | Link | |
Rankiteo Explanation : Attack threatening the organization’s existenceDescription: 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 | 100 | 5 | 04/2019 | YAH22251222 | Link | |
Rankiteo Explanation : Attack threatening the organization’s existenceDescription: Yahoo is trying to settle a lawsuit on the massive data breach over the period of 2013 to 2016. Yahoo paid $117.5 million for the settlement of 3 billion hacked accounts. In January, Yahoo agreed to pay $50 million to data breach victims but the Judge (Lucy Koh) has rejected Yahoo’s proposed settlement over data breaches. The new settlement includes at least $55 million for victims’ out-of-pocket expenses and other costs, $24 million for two years of credit monitoring, up to $30 million for legal fees, and up to $8.5 million for other expenses, | |||||||
| Yahoo | Breach | 100 | 4 | 01/2014 | YAH228141222 | Link | |
Rankiteo Explanation : Attack with significant impact with customers data leaksDescription: 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 | Breach | 60 | 3 | 09/2016 | YAH1045311023 | Link | |
Rankiteo Explanation : Attack with significant impact with internal employee data leaksDescription: The Yahoo suffered from a data breach incident that exposed 500 million user accounts in a data breach dating back to 2014. The account information includes names, email addresses, telephone numbers, dates of birth, hashed passwords and, in some cases, encrypted or unencrypted security questions and answers. According to the current investigation, unencrypted passwords, credit card numbers, and bank account information were not included in the stolen material; these details are not kept in the system that the inquiry has determined to be compromised. Yahoo thinks that information linked to at least 500 million user accounts was taken, based on an ongoing investigation; however, no proof of the state-sponsored actor's presence in Yahoo's network has been discovered. | |||||||
| Yahoo | Breach | 100 | 5 | 10/2014 | YAH203551123 | Link | |
Rankiteo Explanation : Attack threatening the organization’s existenceDescription: 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 | 100 | 12/2016 | YAH35131123 | Link | ||
Rankiteo Explanation : Attack threatening the organization's existenceDescription: 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! Inc. | Breach | 85 | 4 | 12/2014 | YAH012072925 | Link | |
Rankiteo Explanation : Attack with significant impact with customers data leaksDescription: 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. | |||||||
| Leak Zone | Breach | 85 | 4 | 7/2025 | TEC853080725 | Link | |
Rankiteo Explanation : Attack with significant impact with customers data leaksDescription: 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 Company Subsidiaries
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. For advertisers, Yahoo Advertising offers omnichannel solutions and powerful data to engage with our brands and deliver results. To learn more about Yahoo, please visit yahooinc.com.
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Frequently Asked Questions
Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
Yahoo CyberSecurity History Information
How many cyber incidents has Yahoo faced?
Total Incidents: According to Rankiteo, Yahoo has faced 9 incidents in the past.
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 $285 million.
How does Yahoo detect and respond to cybersecurity incidents?
Detection and Response: The company detects and responds to cybersecurity incidents through an containment measures with database locked down and communication strategy with yahoo asked affected users to log into their accounts without passwords..
Incident Details
Can you provide details on each incident?
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! 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 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 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: tessa88, nation-state actor from Eastern Europe
Motivation: Financial gain and espionage
Incident : Data Breach
Title: Yahoo Data Breach
Description: The Yahoo suffered from a data breach incident that exposed 500 million user accounts in a data breach dating back to 2014. The account information includes names, email addresses, telephone numbers, dates of birth, hashed passwords and, in some cases, encrypted or unencrypted security questions and answers. Unencrypted passwords, credit card numbers, and bank account information were not included in the stolen material; these details are not kept in the system that the inquiry has determined to be compromised. Yahoo thinks that information linked to at least 500 million user accounts was taken, based on an ongoing investigation; however, no proof of the state-sponsored actor's presence in Yahoo's network has been discovered.
Date Detected: 2014
Type: Data Breach
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 Settlement
Description: Yahoo is trying to settle a lawsuit on the massive data breach over the period of 2013 to 2016.
Type: Data Breach
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 : 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
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.
Impact of the Incidents
What was the impact of each incident?
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 YAH012072925
Data Compromised: names, email addresses, telephone numbers, dates of birth, hashed passwords
Incident : Data Breach YAH35131123
Data Compromised: phone numbers, addresses, hashed passwords, security questions and answers
Incident : Data Breach YAH203551123
Data Compromised: User authentication data
Incident : Data Breach YAH1045311023
Data Compromised: names, email addresses, telephone numbers, dates of birth, hashed passwords, encrypted or unencrypted security questions and answers
Incident : Data Breach YAH228141222
Data Compromised: Email account details
Incident : Data Breach YAH22251222
Financial Loss: 117.5 million, 50 million, 55 million, 24 million, 30 million, 8.5 million
Data Compromised: 3 billion accounts
Incident : Data Breach YAH1236722
Data Compromised: Names, Email addresses, Telephone numbers, Hashed passwords, Dates of birth, Encrypted or unencrypted security questions and answers
What is the average financial loss per incident?
Average Financial Loss: The average financial loss per incident is $31.67 million.
What types of data are most commonly compromised in incidents?
Commonly Compromised Data Types: The types of data most commonly compromised in incidents are IP addresses, login timestamps, names, email addresses, telephone numbers, dates of birth, hashed passwords, phone numbers, addresses, hashed passwords, security questions and answers, User authentication data, names, email addresses, telephone numbers, dates of birth, hashed passwords, encrypted or unencrypted security questions and answers, Email account details, Names, Email addresses, Telephone numbers, Hashed passwords, Dates of birth and Encrypted or unencrypted security questions and answers.
Which entities were affected by each incident?
Incident : Data Leak TEC853080725
Entity Type: Underground Forum
Industry: Cybercrime
Size: Approximately 100,000 members
Customers Affected: 100,000 members
Incident : Data Breach YAH012072925
Entity Type: Company
Industry: Technology
Customers Affected: 500 million
Incident : Data Breach YAH35131123
Entity Type: Company
Industry: Technology
Location: Global
Size: Large
Customers Affected: One billion
Incident : Data Breach YAH203551123
Entity Type: Company
Industry: Technology
Customers Affected: one billion to three billion
Incident : Data Breach YAH1045311023
Entity Type: Company
Industry: Technology
Customers Affected: 500000000
Incident : Data Breach YAH22251222
Entity Type: Company
Industry: Technology
Customers Affected: 3 billion
Incident : Data Breach YAH1236722
Customers Affected: 32 million
Response to the Incidents
What measures were taken in response to each incident?
Incident : Data Leak TEC853080725
Containment Measures: Database locked down
Incident : Cyber Attack YAH11136722
Communication Strategy: Yahoo asked affected users to log into their accounts without passwords.
Data Breach Information
What type of data was compromised in each breach?
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 YAH012072925
Type of Data Compromised: names, email addresses, telephone numbers, dates of birth, hashed passwords
Number of Records Exposed: 500 million
Personally Identifiable Information: names, email addresses, telephone numbers, dates of birth
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 YAH203551123
Type of Data Compromised: User authentication data
Number of Records Exposed: one billion to three billion
Incident : Data Breach YAH1045311023
Type of Data Compromised: names, email addresses, telephone numbers, dates of birth, hashed passwords, encrypted or unencrypted security questions and answers
Number of Records Exposed: 500000000
Personally Identifiable Information: True
Incident : Data Breach YAH228141222
Type of Data Compromised: Email account details
Incident : Data Breach YAH22251222
Number of Records Exposed: 3 billion
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
Personally Identifiable Information: True
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.
Regulatory Compliance
Were there any regulatory violations and fines imposed for each incident?
Incident : Data Breach YAH22251222
Legal Actions: Settlement agreed
How does the company ensure compliance with regulatory requirements?
Ensuring Regulatory Compliance: The company ensures compliance with regulatory requirements through Settlement agreed.
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.
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.
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.
What recommendations has the company implemented to improve cybersecurity?
Implemented Recommendations: The company has implemented the following recommendations to improve cybersecurity: 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..
References
Where can I find more information about each incident?
Incident : Data Leak TEC853080725
Source: TechCrunch
Incident : Data Breach YAH012072925
Source: California Office of the Attorney General
Date Accessed: 2016-09-22
Where can stakeholders find additional resources on cybersecurity best practices?
Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: TechCrunch, and Source: California Office of the Attorney GeneralDate Accessed: 2016-09-22.
Investigation Status
What is the current status of the investigation for each incident?
Incident : Data Leak TEC853080725
Investigation Status: Resolved (Database locked down)
Incident : Data Breach YAH1045311023
Investigation Status: Ongoing
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 was Yahoo asked affected users to log into their accounts without passwords..
Initial Access Broker
How did the initial access broker gain entry for each incident?
Incident : Data Breach YAH35131123
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
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.
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 State-sponsored actor, Hackers, tessa88 and nation-state actor from Eastern Europe.
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 2016-09-22.
Impact of the Incidents
What was the highest financial loss from an incident?
Highest Financial Loss: The highest financial loss from an incident was ['117.5 million', '50 million', '55 million', '24 million', '30 million', '8.5 million'].
What was the most significant data compromised in an incident?
Most Significant Data Compromised: The most significant data compromised in an incident were IP addresses and login timestamps, names, email addresses, telephone numbers, dates of birth, hashed passwords, phone numbers, addresses, hashed passwords, security questions and answers, User authentication data, names, email addresses, telephone numbers, dates of birth, hashed passwords, encrypted or unencrypted security questions and answers, Email account details, 3 billion accounts, Names, Email addresses, Telephone numbers, Hashed passwords, Dates of birth and Encrypted or unencrypted security questions and answers.
What was the most significant system affected in an incident?
Most Significant System Affected: The most significant system affected in an incident was Elasticsearch Database.
Response to the Incidents
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 IP addresses and login timestamps, names, email addresses, telephone numbers, dates of birth, hashed passwords, phone numbers, addresses, hashed passwords, security questions and answers, User authentication data, names, email addresses, telephone numbers, dates of birth, hashed passwords, encrypted or unencrypted security questions and answers, Email account details, 3 billion accounts, Names, Email addresses, Telephone numbers, Hashed passwords, Dates of birth and Encrypted or unencrypted security questions and answers.
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 3.6B.
Regulatory Compliance
What was the most significant legal action taken for a regulatory violation?
Most Significant Legal Action: The most significant legal action taken for a regulatory violation was Settlement agreed.
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 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.
What was the most significant recommendation implemented to improve cybersecurity?
Most Significant Recommendation Implemented: The most significant recommendation implemented to improve cybersecurity was 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..
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 TechCrunch and California Office of the Attorney General.
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).
What Do We Measure?
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:
Identify exposed access points, detect misconfigured SSL certificates, and uncover vulnerabilities across the network infrastructure.
Gain visibility into the software components used within an organization to detect vulnerabilities, manage risk, and ensure supply chain security.
Monitor and manage all IT assets and their configurations to ensure accurate, real-time visibility across the company's technology environment.
Leverage real-time insights on active threats, malware campaigns, and emerging vulnerabilities to proactively defend against evolving cyberattacks.
