Company Details
ascensionorg
66,110
285,431
62
ascension.org
858
ASC_1647020
Completed

Ascension Company CyberSecurity Posture
ascension.orgAnswering God's call to bring health, healing and hope to all. Ascension is one of the nation’s leading non-profit and Catholic health systems, with a Mission of delivering compassionate, personalized care to all, with special attention to those most vulnerable. In FY2025, Ascension provided $1.7 billion in care of persons living in poverty and other community benefit programs along with $1.8 billion of unreimbursed care for Medicare patients. Across 16 states and the District of Columbia, Ascension’s network encompasses approximately 99,000 associates, 22,300 aligned providers, 95 wholly owned or consolidated hospitals, and ownership interests in 26 additional hospitals through partnerships. Ascension also operates 30 senior living facilities and a variety of other care sites offering a range of healthcare services.
Company Details
ascensionorg
66,110
285,431
62
ascension.org
858
ASC_1647020
Completed
Between 0 and 549

Ascension Global Score (TPRM)XXXX

Description: Ascension Michigan notifies some of its patients of a data breach that happened between Oct. 15, 2015, and Sept. 8, 2021. It noticed suspicious activity in its electronic health record and upon investigation found that an unauthorized individual accessed its patient information. The compromised information included full name, date of birth, address(es), email address(es), phone number(s), health insurance information, health insurance identification number and medical records, Social Security numbers. The Ascension Michigan offered free credit and identity theft protection-monitoring services to the affected patients.
Description: Ascension Health, a Missouri-based hospital system operating 140 hospitals across 19 U.S. states, faced a **May 2024 data breach** exposing the **personal information of over 5 million individuals**. The breach allegedly stemmed from negligent cybersecurity practices, leading to a **proposed class-action lawsuit** for failing to protect sensitive data. Plaintiffs accused Ascension of violating **consumer protection laws in six states**, along with claims of **negligence and negligence per se**. The exposed data—though not explicitly detailed in the article—likely includes **medical, financial, or personally identifiable information (PII)**, given the healthcare context. The breach’s scale and the **legal standing granted by a federal judge** underscore its severity, as it directly threatens **patient trust, regulatory compliance, and potential financial liabilities**. The incident highlights systemic vulnerabilities in healthcare cybersecurity, where data exposures can have **long-term reputational and operational consequences** for providers.
Description: Ascension, one of the largest private healthcare systems in the United States, experienced a data breach that exposed the personal and healthcare information of over 430,000 patients. The incident, disclosed in April, involved a data theft attack impacting a former business partner in December. Attackers accessed personal health information related to inpatient visits, including physician names, admission and discharge dates, diagnosis and billing codes, medical record numbers, and insurance company names. Personal information such as names, addresses, phone numbers, email addresses, dates of birth, race, gender, and Social Security numbers were also compromised. The breach was linked to a vulnerability in third-party software used by the former business partner, likely part of widespread Clop ransomware attacks.
Description: On December 19, 2024, the Maine Office of the Attorney General disclosed a severe data breach affecting **Ascension Health**, stemming from an external hacking incident that occurred on **May 8, 2024**. The breach compromised the personal data of approximately **5,599,699 individuals**, including **658 Maine residents**. The exposed information encompasses highly sensitive details such as **medical records, payment data, insurance information, and government-issued identification documents**.This incident poses a critical threat to the affected individuals, as the leaked data could facilitate **identity theft, financial fraud, and targeted phishing attacks**. The scale of the breach—impacting millions—suggests systemic vulnerabilities in Ascension Health’s cybersecurity defenses, raising concerns about the organization’s ability to safeguard patient confidentiality. The inclusion of **medical and financial data** elevates the risk of long-term harm, including potential **blackmail, fraudulent medical claims, or unauthorized access to healthcare services**. The breach not only undermines trust in Ascension Health but also highlights the broader risks associated with cyberattacks on healthcare providers, where data integrity is paramount for patient safety and operational continuity.
Description: The California Attorney General's Office reported that Ascension Health experienced a ransomware attack on May 8, 2024, affecting personal information of patients and associates. The breach potentially exposed names, medical information, payment information, insurance information, government identification, and other personal information. The number of individuals affected is currently unknown.
Description: On December 19, 2024, the Washington State Office of the Attorney General disclosed a **ransomware attack** targeting **Ascension Health**, initially detected on **May 8, 2024**. The breach compromised the personal data of **5,787 Washington residents**, exposing highly sensitive information, including **Social Security numbers (SSNs) and medical records**. The attack posed severe risks to affected individuals, as exposed SSNs and medical data can facilitate **identity theft, financial fraud, and targeted phishing scams**. Given the nature of the stolen data—health records in particular—the breach also raised concerns about **long-term privacy violations, potential blackmail, and misuse of medical histories**. Ascension Health, a major healthcare provider, faced **reputational damage, regulatory scrutiny, and potential legal liabilities** due to the failure to prevent the attack. The incident underscored vulnerabilities in healthcare cybersecurity, where ransomware groups increasingly target **critical patient data** for extortion. The exposure of such information not only harms individuals but also erodes trust in the organization’s ability to safeguard confidential records. Recovery efforts likely involved **forensic investigations, notification processes, credit monitoring for victims, and system reinforcements** to mitigate future threats.
Description: In February 2024, Ascension, a major healthcare provider, suffered a devastating **ransomware attack** initiated when a contractor clicked a phishing link via Microsoft Bing and Edge. The attack exploited **Kerberoasting**, leveraging Microsoft’s outdated **RC4 encryption** (a 1980s protocol long deemed insecure) to gain administrative privileges through **Active Directory**. Hackers then deployed ransomware across **thousands of systems**, compromising **personal data, medical records, payment/insurance details, and government IDs of over 5.6 million patients**. The breach disrupted hospital operations, delayed critical treatments, and exposed systemic vulnerabilities tied to Microsoft’s default security configurations—including weak password policies for privileged accounts. Despite repeated warnings from **CISA, FBI, and NSA** about RC4 and Kerberoasting risks (notably by state actors like Iran), Microsoft had yet to disable RC4 by default, prolonging exposure. Ascension’s incident underscores the cascading impact of **legacy encryption flaws**, **poor default security settings**, and **third-party contractor risks** in healthcare cybersecurity.
Description: Ascension experienced a ransomware attack involving social engineering which resulted in the data of 5,599,699 individuals being affected. An employee was tricked into downloading malware, resulting in a data breach. Although there was no evidence that data was extracted from their Electronic Health Records (EHR) and other clinical systems where complete patient records are securely kept, personal information was involved and notifications to the affected individuals have been initiated.
Description: Ascension faced a cyber breach where a ransomware attack led to unauthorized disclosure of patient personal information. The incident caused class action lawsuits and disruptions in emergency medical services as well as interruptions to the electronic health records system. Identified as conducted by the Russian-speaking group Black Basta, the attack's consequences included services diversion, posing risks to patient care and data security.
Description: Ascension faced a ransomware attack resulting in severe disruptions across 140 hospitals, implicating patient care and treatment schedules. The recovery was hindered by the need for 'assurance' letters to reconnect systems with suppliers, adding to the operational chaos. The impact extended to canceled appointments and surgeries, and pushed medical staff to revert to manual processes. The organization's swift action towards transparency and reconnection of supplies post-attack mitigated prolonged delays.


Ascension has 33.33% more incidents than the average of same-industry companies with at least one recorded incident.
Ascension has 53.85% more incidents than the average of all companies with at least one recorded incident.
Ascension reported 1 incidents this year: 0 cyber attacks, 0 ransomware, 0 vulnerabilities, 1 data breaches, compared to industry peers with at least 1 incident.
Ascension cyber incidents detection timeline including parent company and subsidiaries

Answering God's call to bring health, healing and hope to all. Ascension is one of the nation’s leading non-profit and Catholic health systems, with a Mission of delivering compassionate, personalized care to all, with special attention to those most vulnerable. In FY2025, Ascension provided $1.7 billion in care of persons living in poverty and other community benefit programs along with $1.8 billion of unreimbursed care for Medicare patients. Across 16 states and the District of Columbia, Ascension’s network encompasses approximately 99,000 associates, 22,300 aligned providers, 95 wholly owned or consolidated hospitals, and ownership interests in 26 additional hospitals through partnerships. Ascension also operates 30 senior living facilities and a variety of other care sites offering a range of healthcare services.


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Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
The official website of Ascension is http://www.ascension.org/.
According to Rankiteo, Ascension’s AI-generated cybersecurity score is 132, reflecting their Critical security posture.
According to Rankiteo, Ascension currently holds 0 security badges, indicating that no recognized compliance certifications are currently verified for the organization.
According to Rankiteo, Ascension is not certified under SOC 2 Type 1.
According to Rankiteo, Ascension does not hold a SOC 2 Type 2 certification.
According to Rankiteo, Ascension is not listed as GDPR compliant.
According to Rankiteo, Ascension does not currently maintain PCI DSS compliance.
According to Rankiteo, Ascension is not compliant with HIPAA regulations.
According to Rankiteo,Ascension is not certified under ISO 27001, indicating the absence of a formally recognized information security management framework.
Ascension operates primarily in the Hospitals and Health Care industry.
Ascension employs approximately 66,110 people worldwide.
Ascension presently has no subsidiaries across any sectors.
Ascension’s official LinkedIn profile has approximately 285,431 followers.
Ascension is classified under the NAICS code 62, which corresponds to Health Care and Social Assistance.
No, Ascension does not have a profile on Crunchbase.
Yes, Ascension maintains an official LinkedIn profile, which is actively utilized for branding and talent engagement, which can be accessed here: https://www.linkedin.com/company/ascensionorg.
As of December 10, 2025, Rankiteo reports that Ascension has experienced 10 cybersecurity incidents.
Ascension has an estimated 30,832 peer or competitor companies worldwide.
Incident Types: The types of cybersecurity incidents that have occurred include Cyber Attack, Ransomware and Breach.
Detection and Response: The company detects and responds to cybersecurity incidents through an remediation measures with free credit and identity theft protection-monitoring services, and communication strategy with notified affected patients, and recovery measures with transparency, recovery measures with reconnection of supplies, and communication strategy with transparency, and communication strategy with notifications to affected individuals..
Title: Ascension Michigan Data Breach
Description: Ascension Michigan notifies some of its patients of a data breach that happened between Oct. 15, 2015, and Sept. 8, 2021. It noticed suspicious activity in its electronic health record and upon investigation found that an unauthorized individual accessed its patient information. The compromised information included full name, date of birth, address(es), email address(es), phone number(s), health insurance information, health insurance identification number and medical records, Social Security numbers. Ascension Michigan offered free credit and identity theft protection-monitoring services to the affected patients.
Date Detected: 2021-09-08
Type: Data Breach
Attack Vector: Unauthorized Access
Threat Actor: Unauthorized Individual
Title: Ransomware Attack on Ascension
Description: Ascension faced a ransomware attack resulting in severe disruptions across 140 hospitals, implicating patient care and treatment schedules. The recovery was hindered by the need for 'assurance' letters to reconnect systems with suppliers, adding to the operational chaos. The impact extended to canceled appointments and surgeries, and pushed medical staff to revert to manual processes. The organization's swift action towards transparency and reconnection of supplies post-attack mitigated prolonged delays.
Type: Ransomware
Title: Ascension Ransomware Attack
Description: Ascension experienced a ransomware attack involving social engineering which resulted in the data of 5,599,699 individuals being affected.
Type: Ransomware Attack
Attack Vector: Social Engineering
Vulnerability Exploited: Human Error
Motivation: Financial
Title: Ascension Ransomware Attack
Description: Ascension faced a cyber breach where a ransomware attack led to unauthorized disclosure of patient personal information. The incident caused class action lawsuits and disruptions in emergency medical services as well as interruptions to the electronic health records system. Identified as conducted by the Russian-speaking group Black Basta, the attack's consequences included services diversion, posing risks to patient care and data security.
Type: Ransomware Attack
Threat Actor: Black Basta
Title: Ascension Healthcare Data Breach
Description: Ascension, one of the largest private healthcare systems in the United States, experienced a data breach that exposed the personal and healthcare information of over 430,000 patients. The incident, disclosed in April, involved a data theft attack impacting a former business partner in December. Attackers accessed personal health information related to inpatient visits, including physician names, admission and discharge dates, diagnosis and billing codes, medical record numbers, and insurance company names. Personal information such as names, addresses, phone numbers, email addresses, dates of birth, race, gender, and Social Security numbers were also compromised. The breach was linked to a vulnerability in third-party software used by the former business partner, likely part of widespread Clop ransomware attacks.
Date Detected: December
Date Publicly Disclosed: April
Type: Data Breach
Attack Vector: Vulnerability in third-party software
Vulnerability Exploited: Third-party software vulnerability
Threat Actor: Clop ransomware group
Motivation: Data theft
Title: Ascension Health Ransomware Attack
Description: The California Attorney General's Office reported that Ascension Health experienced a ransomware attack on May 8, 2024, affecting personal information of patients and associates. The breach potentially exposed names, medical information, payment information, insurance information, government identification, and other personal information. The number of individuals affected is currently unknown.
Date Detected: 2024-05-08
Type: Ransomware Attack
Title: Ascension Health Data Breach (2024)
Description: The Maine Office of the Attorney General reported a data breach involving Ascension Health on December 19, 2024. The breach occurred on May 8, 2024, due to an external hacking incident, affecting approximately 5,599,699 individuals in total, with 658 Maine residents specifically impacted. Personal data potentially compromised includes medical, payment, insurance, and government identification information.
Date Detected: 2024-05-08
Date Publicly Disclosed: 2024-12-19
Type: Data Breach
Attack Vector: External Hacking
Title: Ascension Hospital Ransomware Attack (2024)
Description: A ransomware attack on Ascension hospital in 2024 resulted in the theft of personal data, medical data, payment information, insurance information, and government IDs for over 5.6 million patients. The attack originated from a contractor clicking a phishing link via Microsoft Bing and Edge, exploiting vulnerabilities in Microsoft's Active Directory (Kerberoasting technique) due to outdated RC4 encryption support. Hackers gained administrative privileges and deployed ransomware across thousands of systems.
Date Detected: 2024-02
Type: ransomware
Attack Vector: phishingexploitation of outdated encryption (RC4)Kerberoastingprivilege escalation via Active Directory
Vulnerability Exploited: RC4 encryption (obsolete since 1980s)Kerberoasting in Active Directorydefault weak password policies (privileged accounts <14 characters)
Motivation: financial gain (ransomware)data theft
Title: Ascension Health Ransomware Attack and Data Breach (2024)
Description: On December 19, 2024, the Washington State Office of the Attorney General reported a data breach involving Ascension Health, discovered on May 8, 2024. The breach was caused by a ransomware attack affecting approximately 5,787 Washington residents and potentially exposing personal information, including social security numbers and medical data.
Date Detected: 2024-05-08
Date Publicly Disclosed: 2024-12-19
Type: ransomware
Title: Ascension Health Data Breach (May 2024)
Description: Missouri-based Ascension Health faced a proposed class action alleging negligent failure to protect the personal information of over 5 million people exposed in a May 2024 data breach. Plaintiffs claimed violations of consumer protection laws in six states, negligence, and negligence per se. The breach affected Ascension, a hospital system with 140 hospitals across 19 states.
Type: Data Breach
Common Attack Types: The most common types of attacks the company has faced is Ransomware.
Identification of Attack Vectors: The company identifies the attack vectors used in incidents through Social Engineering and phishing link clicked via Microsoft Bing/Edge on contractor’s laptop.

Data Compromised: Full name, Date of birth, Address(es), Email address(es), Phone number(s), Health insurance information, Health insurance identification number, Medical records, Social security numbers
Systems Affected: Electronic Health Record
Identity Theft Risk: High

Systems Affected: 140 hospitals
Operational Impact: Canceled appointmentsCanceled surgeriesReverted to manual processes

Data Compromised: Personal information
Systems Affected: Electronic Health Records (EHR)Other Clinical Systems

Data Compromised: Patient personal information
Systems Affected: Electronic health records systemEmergency medical services
Downtime: Services diversion
Operational Impact: Disruptions in emergency medical services and interruptions to the electronic health records system
Legal Liabilities: Class action lawsuits

Data Compromised: Personal health information, Physician names, Admission and discharge dates, Diagnosis and billing codes, Medical record numbers, Insurance company names, Names, Addresses, Phone numbers, Email addresses, Dates of birth, Race, Gender, Social security numbers

Data Compromised: Names, Medical information, Payment information, Insurance information, Government identification, Other personal information

Data Compromised: Medical information, Payment information, Insurance information, Government identification information
Identity Theft Risk: High
Payment Information Risk: High

Data Compromised: Personal data, Medical records, Payment information, Insurance information, Government ids
Systems Affected: thousands of computers
Operational Impact: severe (healthcare operations disrupted)
Brand Reputation Impact: high (public scrutiny, regulatory concern)
Identity Theft Risk: high (5.6M records exposed)
Payment Information Risk: high

Data Compromised: Social security numbers, Medical information
Identity Theft Risk: high

Data Compromised: Personal information
Customer Complaints: Class action lawsuit filed
Brand Reputation Impact: Significant (class action alleging negligence)
Legal Liabilities: Proposed class action for negligence, negligence per se, and violations of consumer protection laws in six states
Identity Theft Risk: High (personal information of 5M+ exposed)
Commonly Compromised Data Types: The types of data most commonly compromised in incidents are Personally Identifiable Information, Health Information, , Personal Information, , Patient personal information, Personal Health Information, Personal Information, , Names, Medical Information, Payment Information, Insurance Information, Government Identification, Other Personal Information, , Medical, Payment, Insurance, Government Identification, , Personal Data, Medical Records, Payment Information, Insurance Details, Government Ids, , Personally Identifiable Information (Pii), Protected Health Information (Phi), and Personal Information.

Entity Name: Ascension Michigan
Entity Type: Healthcare Provider
Industry: Healthcare
Location: Michigan

Entity Name: Ascension
Entity Type: Healthcare
Industry: Healthcare
Size: 140 hospitals

Entity Name: Ascension
Entity Type: Healthcare
Industry: Healthcare
Customers Affected: 5599699

Entity Name: Ascension
Entity Type: Healthcare
Industry: Healthcare

Entity Name: Ascension
Entity Type: Healthcare System
Industry: Healthcare
Location: United States
Customers Affected: 430000

Entity Name: Ascension Health
Entity Type: Healthcare Provider
Industry: Healthcare

Entity Name: Ascension Health
Entity Type: Healthcare Provider
Industry: Healthcare
Location: United States
Customers Affected: 5,599,699 (658 in Maine)

Entity Name: Ascension
Entity Type: healthcare provider
Industry: healthcare
Location: United States
Customers Affected: 5.6 million patients

Entity Name: Ascension Health
Entity Type: healthcare provider
Industry: healthcare
Location: United States (Washington residents affected)
Customers Affected: 5,787

Entity Name: Ascension Health
Entity Type: Hospital System
Industry: Healthcare
Location: Missouri, USA (operates in 19 states)
Size: 140 hospitals
Customers Affected: 5,000,000+

Remediation Measures: Free credit and identity theft protection-monitoring services
Communication Strategy: Notified affected patients

Recovery Measures: TransparencyReconnection of supplies
Communication Strategy: Transparency

Communication Strategy: Notifications to affected individuals

Type of Data Compromised: Personally identifiable information, Health information
Sensitivity of Data: High
Personally Identifiable Information: full namedate of birthaddress(es)email address(es)phone number(s)Social Security numbers

Type of Data Compromised: Personal information
Number of Records Exposed: 5599699
Sensitivity of Data: High

Type of Data Compromised: Patient personal information

Type of Data Compromised: Personal health information, Personal information
Number of Records Exposed: 430000
Sensitivity of Data: High
Personally Identifiable Information: NamesAddressesPhone numbersEmail addressesDates of birthRaceGenderSocial Security numbers

Type of Data Compromised: Names, Medical information, Payment information, Insurance information, Government identification, Other personal information

Type of Data Compromised: Medical, Payment, Insurance, Government identification
Number of Records Exposed: 5,599,699
Sensitivity of Data: High

Type of Data Compromised: Personal data, Medical records, Payment information, Insurance details, Government ids
Number of Records Exposed: 5.6 million
Sensitivity of Data: high (PII, PHI, financial data)
Data Exfiltration: yes
Data Encryption: no (RC4 encryption exploited)
Personally Identifiable Information: yes

Type of Data Compromised: Personally identifiable information (pii), Protected health information (phi)
Number of Records Exposed: 5,787
Sensitivity of Data: high
Personally Identifiable Information: social security numbersmedical information

Type of Data Compromised: Personal Information
Number of Records Exposed: 5,000,000+
Sensitivity of Data: High
Personally Identifiable Information: Yes
Prevention of Data Exfiltration: The company takes the following measures to prevent data exfiltration: Free credit and identity theft protection-monitoring services, .

Data Encryption: True

Ransomware Strain: Clop

Data Encryption: yes (ransomware deployed across systems)
Data Exfiltration: yes
Data Recovery from Ransomware: The company recovers data encrypted by ransomware through Transparency, Reconnection of supplies, .

Legal Actions: Class action lawsuits

Regulatory Notifications: Maine Office of the Attorney General

Legal Actions: Sen. Ron Wyden's call for FTC investigation into Microsoft's default security configurations,
Regulatory Notifications: CISA, FBI, NSA warnings (2023–2024) about RC4/Kerberoasting exploits in healthcare

Regulatory Notifications: Washington State Office of the Attorney General

Regulations Violated: Consumer Protection Laws (six states),
Legal Actions: Proposed class action lawsuit (negligence, negligence per se, consumer protection violations)
Ensuring Regulatory Compliance: The company ensures compliance with regulatory requirements through Class action lawsuits, Sen. Ron Wyden's call for FTC investigation into Microsoft's default security configurations, , Proposed class action lawsuit (negligence, negligence per se, consumer protection violations).

Lessons Learned: Default configurations in enterprise software (e.g., Microsoft Active Directory) can enable large-scale breaches if outdated protocols (e.g., RC4) are retained., Kerberoasting exploits persist due to legacy encryption support, despite decades of warnings., Organizations rarely modify default security settings, placing burden on vendors to enforce secure defaults., Phishing remains a critical initial access vector, especially via default applications (e.g., Microsoft Edge/Bing).

Recommendations: Microsoft should disable RC4 by default immediately (planned for Q1 2026 is insufficient)., Enforce stronger default password policies for privileged accounts (e.g., 14+ characters)., Healthcare sector should prioritize patching Active Directory vulnerabilities and monitoring for Kerberoasting., Vendors must proactively deprecate obsolete encryption standards, even if it risks breaking legacy systems., Public disclosure of timelines for security fixes should be accelerated to reduce exposure windows.Microsoft should disable RC4 by default immediately (planned for Q1 2026 is insufficient)., Enforce stronger default password policies for privileged accounts (e.g., 14+ characters)., Healthcare sector should prioritize patching Active Directory vulnerabilities and monitoring for Kerberoasting., Vendors must proactively deprecate obsolete encryption standards, even if it risks breaking legacy systems., Public disclosure of timelines for security fixes should be accelerated to reduce exposure windows.Microsoft should disable RC4 by default immediately (planned for Q1 2026 is insufficient)., Enforce stronger default password policies for privileged accounts (e.g., 14+ characters)., Healthcare sector should prioritize patching Active Directory vulnerabilities and monitoring for Kerberoasting., Vendors must proactively deprecate obsolete encryption standards, even if it risks breaking legacy systems., Public disclosure of timelines for security fixes should be accelerated to reduce exposure windows.Microsoft should disable RC4 by default immediately (planned for Q1 2026 is insufficient)., Enforce stronger default password policies for privileged accounts (e.g., 14+ characters)., Healthcare sector should prioritize patching Active Directory vulnerabilities and monitoring for Kerberoasting., Vendors must proactively deprecate obsolete encryption standards, even if it risks breaking legacy systems., Public disclosure of timelines for security fixes should be accelerated to reduce exposure windows.Microsoft should disable RC4 by default immediately (planned for Q1 2026 is insufficient)., Enforce stronger default password policies for privileged accounts (e.g., 14+ characters)., Healthcare sector should prioritize patching Active Directory vulnerabilities and monitoring for Kerberoasting., Vendors must proactively deprecate obsolete encryption standards, even if it risks breaking legacy systems., Public disclosure of timelines for security fixes should be accelerated to reduce exposure windows.
Key Lessons Learned: The key lessons learned from past incidents are Default configurations in enterprise software (e.g., Microsoft Active Directory) can enable large-scale breaches if outdated protocols (e.g., RC4) are retained.,Kerberoasting exploits persist due to legacy encryption support, despite decades of warnings.,Organizations rarely modify default security settings, placing burden on vendors to enforce secure defaults.,Phishing remains a critical initial access vector, especially via default applications (e.g., Microsoft Edge/Bing).

Source: California Attorney General's Office

Source: Maine Office of the Attorney General
Date Accessed: 2024-12-19

Source: CyberScoop

Source: Sen. Ron Wyden’s letter to FTC Chair Andrew Ferguson

Source: CISA, FBI, NSA joint advisory (2023–2024) on RC4/Kerberoasting

Source: Washington State Office of the Attorney General
Date Accessed: 2024-12-19

Source: US District Court for the Eastern District of Missouri (Judge John A. Ross ruling)
Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: California Attorney General's Office, and Source: Maine Office of the Attorney GeneralDate Accessed: 2024-12-19, and Source: CyberScoop, and Source: Sen. Ron Wyden’s letter to FTC Chair Andrew Ferguson, and Source: CISA, FBI, NSA joint advisory (2023–2024) on RC4/Kerberoasting, and Source: Washington State Office of the Attorney GeneralDate Accessed: 2024-12-19, and Source: US District Court for the Eastern District of Missouri (Judge John A. Ross ruling).

Investigation Status: ongoing (FTC investigation requested by Sen. Wyden)

Investigation Status: Ongoing (class action lawsuit in progress)
Communication of Investigation Status: The company communicates the status of incident investigations to stakeholders through Notified Affected Patients, Transparency and Notifications To Affected Individuals.

Customer Advisories: Notifications to affected individuals

Stakeholder Advisories: Sen. Wyden’S Oversight Findings Shared With Ascension And Microsoft.
Advisories Provided: The company provides the following advisories to stakeholders and customers following an incident: were Notifications To Affected Individuals, and Sen. Wyden’S Oversight Findings Shared With Ascension And Microsoft.

Entry Point: Social Engineering

Entry Point: phishing link clicked via Microsoft Bing/Edge on contractor’s laptop
High Value Targets: Active Directory Administrative Privileges,
Data Sold on Dark Web: Active Directory Administrative Privileges,

Root Causes: Human Error,

Root Causes: Use Of Obsolete Rc4 Encryption In Active Directory (Enabled By Default)., Default Weak Password Policies For Privileged Accounts., Phishing Attack Via Default Microsoft Applications (Edge/Bing)., Lack Of Network Segmentation Allowing Lateral Movement To Thousands Of Systems.,
Corrective Actions: Microsoft’S Planned Deprecation Of Rc4 (Q1 2026 For Active Directory)., Ascension Likely Implemented Stricter Password Policies And Active Directory Monitoring Post-Breach.,
Corrective Actions Taken: The company has taken the following corrective actions based on post-incident analysis: Microsoft’S Planned Deprecation Of Rc4 (Q1 2026 For Active Directory)., Ascension Likely Implemented Stricter Password Policies And Active Directory Monitoring Post-Breach., .
Last Attacking Group: The attacking group in the last incident were an Unauthorized Individual, Black Basta and Clop ransomware group.
Most Recent Incident Detected: The most recent incident detected was on 2021-09-08.
Most Recent Incident Publicly Disclosed: The most recent incident publicly disclosed was on 2024-12-19.
Most Significant Data Compromised: The most significant data compromised in an incident were full name, date of birth, address(es), email address(es), phone number(s), health insurance information, health insurance identification number, medical records, Social Security numbers, , Personal Information, , Patient personal information, Personal health information, Physician names, Admission and discharge dates, Diagnosis and billing codes, Medical record numbers, Insurance company names, Names, Addresses, Phone numbers, Email addresses, Dates of birth, Race, Gender, Social Security numbers, , names, medical information, payment information, insurance information, government identification, other personal information, , Medical Information, Payment Information, Insurance Information, Government Identification Information, , personal data, medical records, payment information, insurance information, government IDs, , social security numbers, medical information, , Personal Information and .
Most Significant System Affected: The most significant system affected in an incident was Electronic Health Record and and Electronic Health Records (EHR)Other Clinical Systems and Electronic health records systemEmergency medical services and .
Most Sensitive Data Compromised: The most sensitive data compromised in a breach were date of birth, Race, Admission and discharge dates, Social Security numbers, full name, Diagnosis and billing codes, Phone numbers, medical information, names, insurance information, government IDs, address(es), other personal information, payment information, Personal health information, Addresses, Insurance Information, email address(es), personal data, medical records, Personal Information, Payment Information, Government Identification Information, phone number(s), Dates of birth, Gender, Medical Information, social security numbers, Patient personal information, government identification, Physician names, health insurance information, Names, Email addresses, health insurance identification number, Insurance company names and Medical record numbers.
Number of Records Exposed in Most Significant Breach: The number of records exposed in the most significant breach was 16.2M.
Most Significant Legal Action: The most significant legal action taken for a regulatory violation was Class action lawsuits, Sen. Ron Wyden's call for FTC investigation into Microsoft's default security configurations, , Proposed class action lawsuit (negligence, negligence per se, consumer protection violations).
Most Significant Lesson Learned: The most significant lesson learned from past incidents was Phishing remains a critical initial access vector, especially via default applications (e.g., Microsoft Edge/Bing).
Most Significant Recommendation Implemented: The most significant recommendation implemented to improve cybersecurity was Vendors must proactively deprecate obsolete encryption standards, even if it risks breaking legacy systems., Microsoft should disable RC4 by default immediately (planned for Q1 2026 is insufficient)., Enforce stronger default password policies for privileged accounts (e.g., 14+ characters)., Healthcare sector should prioritize patching Active Directory vulnerabilities and monitoring for Kerberoasting. and Public disclosure of timelines for security fixes should be accelerated to reduce exposure windows..
Most Recent Source: The most recent source of information about an incident are CyberScoop, US District Court for the Eastern District of Missouri (Judge John A. Ross ruling), Sen. Ron Wyden’s letter to FTC Chair Andrew Ferguson, Washington State Office of the Attorney General, Maine Office of the Attorney General, California Attorney General's Office, CISA, FBI and NSA joint advisory (2023–2024) on RC4/Kerberoasting.
Current Status of Most Recent Investigation: The current status of the most recent investigation is ongoing (FTC investigation requested by Sen. Wyden).
Most Recent Stakeholder Advisory: The most recent stakeholder advisory issued was Sen. Wyden’s oversight findings shared with Ascension and Microsoft, .
Most Recent Customer Advisory: The most recent customer advisory issued was an Notifications to affected individuals.
Most Recent Entry Point: The most recent entry point used by an initial access broker were an Social Engineering and phishing link clicked via Microsoft Bing/Edge on contractor’s laptop.
Most Significant Root Cause: The most significant root cause identified in post-incident analysis was Human Error, Use of obsolete RC4 encryption in Active Directory (enabled by default).Default weak password policies for privileged accounts.Phishing attack via default Microsoft applications (Edge/Bing).Lack of network segmentation allowing lateral movement to thousands of systems..
Most Significant Corrective Action: The most significant corrective action taken based on post-incident analysis was Microsoft’s planned deprecation of RC4 (Q1 2026 for Active Directory).Ascension likely implemented stricter password policies and Active Directory monitoring post-breach..
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WeGIA is an open source Web Manager for Institutions with a focus on Portuguese language users. Versions 3.5.4 and below contain a Stored Cross-Site Scripting (XSS) vulnerability in the /WeGIA/html/geral/configurar_senhas.php endpoint. The application does not sanitize user-controlled data before rendering it inside the employee selection dropdown. The application retrieves employee names from the database and injects them directly into HTML <option> elements without proper escaping. This issue is fixed in version 3.5.5.
ZITADEL is an open-source identity infrastructure tool. Versions 4.0.0-rc.1 through 4.7.0 are vulnerable to DOM-Based XSS through the Zitadel V2 logout endpoint. The /logout endpoint insecurely routes to a value that is supplied in the post_logout_redirect GET parameter. As a result, unauthenticated remote attacker can execute malicious JS code on Zitadel users’ browsers. To carry out an attack, multiple user sessions need to be active in the same browser, however, account takeover is mitigated when using Multi-Factor Authentication (MFA) or Passwordless authentication. This issue is fixed in version 4.7.1.
ZITADEL is an open-source identity infrastructure tool. Versions 4.7.0 and below are vulnerable to an unauthenticated, full-read SSRF vulnerability. The ZITADEL Login UI (V2) treats the x-zitadel-forward-host header as a trusted fallback for all deployments, including self-hosted instances. This allows an unauthenticated attacker to force the server to make HTTP requests to arbitrary domains, such as internal addresses, and read the responses, enabling data exfiltration and bypassing network-segmentation controls. This issue is fixed in version 4.7.1.
NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to directory traversal through the App.add_media_files() function, which allows a remote attacker to read arbitrary files on the server filesystem. This issue is fixed in version 3.4.0.
FreePBX Endpoint Manager is a module for managing telephony endpoints in FreePBX systems. Versions are vulnerable to authentication bypass when the authentication type is set to "webserver." When providing an Authorization header with an arbitrary value, a session is associated with the target user regardless of valid credentials. This issue is fixed in versions 16.0.44 and 17.0.23.

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