Company Details
yale-new-haven-health-system
5,470
63,524
62
ynhhs.org
0
YAL_2812553
In-progress


Yale New Haven Health Company CyberSecurity Posture
ynhhs.orgYale New Haven Health is making it easier for people to access the latest medical treatments, advanced research and innovations through our five outstanding hospitals – Yale New Haven, Bridgeport, Greenwich, Lawrence + Memorial and Westerly – and our affiliation with the prestigious Yale University and its highly-ranked Yale School of Medicine. Plus, our patients benefit from access to hundreds of dedicated primary care physicians and specialists in Northeast Medical Group and Yale Medicine. We also have advanced clinical relationships with multiple hospitals and numerous outpatient locations throughout the state so you can get the care you need, when you need it. As one organization, we’re working together to make health care more patient-focused, more accessible and more cost-effective. Some call it personalized medicine. We call it good care. For more information, check out the YNHHS Web site: www.ynhhs.org
Company Details
yale-new-haven-health-system
5,470
63,524
62
ynhhs.org
0
YAL_2812553
In-progress
Between 600 and 649

YNH Global Score (TPRM)XXXX

Description: Yale New Haven Health experienced a cybersecurity incident over the weekend that disrupted IT services across its health system. The organization identified the issue promptly and engaged Mandiant, a cybersecurity firm, to investigate. While the incident did not compromise patient care, electronic medical records, or the patient portal, it caused intermittent internet and application connectivity problems, leading to delays and operational disruptions. Phone and internet connection issues impacted administrative workflows, requiring teams to rebuild access to critical programs. The organization notified federal authorities and assured staff, patients, and the community that updates would be provided as the situation evolved. The focus remains on restoring full system access while minimizing inconvenience to patients and staff.
Description: Yale New Haven Health suffered a massive data breach exposing the protected health information (PHI) of 5,556,702 individuals, making it the largest healthcare data breach of 2025. The incident compromised sensitive patient records, including medical histories, treatment details, and personally identifiable information (PII). Such a breach poses severe risks, including identity theft, medical fraud, and unauthorized disclosure of confidential health data. The scale of the breach suggests a systemic failure in cybersecurity defenses, potentially due to phishing, unpatched vulnerabilities, or third-party vendor compromises. Given the healthcare sector’s regulatory obligations (HIPAA), the breach will likely result in heavy fines, legal repercussions, and long-term reputational damage. Patients may face targeted scams, blackmail, or discriminatory risks if their medical conditions are exposed. The incident also undermines public trust in digital health systems, possibly leading to patient attrition and financial losses from remediation efforts, lawsuits, and regulatory penalties.
Description: In March, YNHHS experienced a cybersecurity breach where an unauthorized third party accessed patients’ sensitive data, including demographic information, Social Security numbers, patient types, and medical record numbers. While the breach did not compromise electronic medical records, treatment data, or financial accounts, it exposed personally identifiable information (PII) of patients, leading to a class-action lawsuit. YNHHS agreed to an $18 million settlement fund, with $6 million allocated to attorney fees and $12 million for affected individuals offering reimbursements up to $5,000 for documented losses or a flat $100 payment. The breach prompted allegations of inadequate security measures and delayed patient notifications. Despite denying liability, YNHHS committed to enhancing cybersecurity protocols to prevent future incidents. The settlement also includes injunctive relief mandating improved data security practices. The breach impacted thousands of patients, risking identity theft and reputational harm to the health system.


No incidents recorded for Yale New Haven Health in 2026.
No incidents recorded for Yale New Haven Health in 2026.
No incidents recorded for Yale New Haven Health in 2026.
YNH cyber incidents detection timeline including parent company and subsidiaries

Yale New Haven Health is making it easier for people to access the latest medical treatments, advanced research and innovations through our five outstanding hospitals – Yale New Haven, Bridgeport, Greenwich, Lawrence + Memorial and Westerly – and our affiliation with the prestigious Yale University and its highly-ranked Yale School of Medicine. Plus, our patients benefit from access to hundreds of dedicated primary care physicians and specialists in Northeast Medical Group and Yale Medicine. We also have advanced clinical relationships with multiple hospitals and numerous outpatient locations throughout the state so you can get the care you need, when you need it. As one organization, we’re working together to make health care more patient-focused, more accessible and more cost-effective. Some call it personalized medicine. We call it good care. For more information, check out the YNHHS Web site: www.ynhhs.org


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Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
The official website of Yale New Haven Health is http://www.ynhhs.org.
According to Rankiteo, Yale New Haven Health’s AI-generated cybersecurity score is 602, reflecting their Poor security posture.
According to Rankiteo, Yale New Haven Health currently holds 0 security badges, indicating that no recognized compliance certifications are currently verified for the organization.
According to Rankiteo, Yale New Haven Health has not been affected by any supply chain cyber incidents, and no incident IDs are currently listed for the organization.
According to Rankiteo, Yale New Haven Health is not certified under SOC 2 Type 1.
According to Rankiteo, Yale New Haven Health does not hold a SOC 2 Type 2 certification.
According to Rankiteo, Yale New Haven Health is not listed as GDPR compliant.
According to Rankiteo, Yale New Haven Health does not currently maintain PCI DSS compliance.
According to Rankiteo, Yale New Haven Health is not compliant with HIPAA regulations.
According to Rankiteo,Yale New Haven Health is not certified under ISO 27001, indicating the absence of a formally recognized information security management framework.
Yale New Haven Health operates primarily in the Hospitals and Health Care industry.
Yale New Haven Health employs approximately 5,470 people worldwide.
Yale New Haven Health presently has no subsidiaries across any sectors.
Yale New Haven Health’s official LinkedIn profile has approximately 63,524 followers.
Yale New Haven Health is classified under the NAICS code 62, which corresponds to Health Care and Social Assistance.
No, Yale New Haven Health does not have a profile on Crunchbase.
Yes, Yale New Haven Health maintains an official LinkedIn profile, which is actively utilized for branding and talent engagement, which can be accessed here: https://www.linkedin.com/company/yale-new-haven-health-system.
As of January 23, 2026, Rankiteo reports that Yale New Haven Health has experienced 3 cybersecurity incidents.
Yale New Haven Health has an estimated 31,602 peer or competitor companies worldwide.
Incident Types: The types of cybersecurity incidents that have occurred include Cyber Attack and Breach.
Total Financial Loss: The total financial loss from these incidents is estimated to be $18 million.
Detection and Response: The company detects and responds to cybersecurity incidents through an third party assistance with mandiant (cybersecurity firm), and and containment measures with mitigation efforts by digital and technology solutions team, and remediation measures with rebuilding access to programs, and recovery measures with restoring full system access, and communication strategy with public statement, communication strategy with updates to staff and patients as appropriate, and incident response plan activated with yes (quick identification and containment), and containment measures with unspecified (successful containment per ynhhs statement), and communication strategy with public statement (2023-04-11), communication strategy with detailed explanation (2023-04-11), communication strategy with settlement announcement (2024-09-10), and enhanced monitoring with committed to strengthening data security measures post-breach, and communication strategy with public disclosure..
Title: Cybersecurity Incident at Yale New Haven Health Affecting IT Services
Description: Yale New Haven Health is investigating a cybersecurity incident over the weekend that disrupted IT services across its health system. The incident caused intermittent internet and application connectivity issues, though patient care, the patient portal, and electronic medical records remained unaffected. The organization is working with Mandiant to investigate and has notified federal authorities. Phone and internet connection issues have impacted patient care operations, and teams are actively rebuilding access to affected programs.
Date Detected: 2023-10-14T00:00:00Z
Date Publicly Disclosed: 2023-10-16T00:00:00Z
Type: IT service disruption
Title: Yale New Haven Health System Data Breach (March 2023)
Description: An unauthorized third party accessed patients’ information in a cybersecurity breach at Yale New Haven Health System (YNHHS). The breach exposed demographic data, Social Security numbers, patient type, and medical record numbers, though electronic medical records and financial/payment information were not compromised. YNHHS agreed to an $18 million settlement fund, including $6 million for attorney fees and $2,500 service awards for class representatives. Affected individuals may claim up to $5,000 for documented losses or a $100 cash payment. The settlement also mandates enhanced data security measures. YNHHS denied liability but settled to avoid prolonged litigation.
Date Detected: 2023-03
Date Publicly Disclosed: 2023-04-11
Type: Data Breach
Threat Actor: Unauthorized third party
Title: Yale New Haven Health Data Breach (2025)
Description: Yale New Haven Health has disclosed a data security incident that compromised the protected health information of up to 5,556,702 individuals, marking the largest healthcare data breach reported in 2025.
Type: Data Breach
Common Attack Types: The most common types of attacks the company has faced is Breach.

Systems Affected: IT servicesinternet connectivityapplication accessphone systems
Downtime: intermittent (ongoing as of disclosure)
Operational Impact: phone and internet connection delayslimited access to certain programs
Brand Reputation Impact: potential (due to service delays)

Financial Loss: $18 million (settlement fund, including $6 million for attorney fees)
Data Compromised: Demographic information, Social security numbers, Patient type, Medical record numbers
Operational Impact: None (uninterrupted patient care maintained)
Customer Complaints: Class action lawsuit filed (2023-04-16)
Brand Reputation Impact: Negative (lawsuit, public disclosure of breach)
Legal Liabilities: $18 million settlement (preliminary approval 2024, final hearing scheduled for 2026-03-03)
Identity Theft Risk: High (Social Security numbers exposed)
Payment Information Risk: None (no financial/payment data accessed)

Data Compromised: Protected health information (phi)
Brand Reputation Impact: High (largest healthcare breach of 2025)
Identity Theft Risk: High (PHI exposed)
Average Financial Loss: The average financial loss per incident is $6.00 million.
Commonly Compromised Data Types: The types of data most commonly compromised in incidents are Demographic Information, Social Security Numbers, Patient Type, Medical Record Numbers, , Protected Health Information (Phi) and .

Entity Name: Yale New Haven Health
Entity Type: healthcare system
Industry: healthcare
Location: Connecticut, USA

Entity Name: Yale New Haven Health System (YNHHS)
Entity Type: Healthcare System
Industry: Healthcare
Location: Bridgeport, Connecticut, USA
Size: 12,000+ employees; 4,500 university/community physicians

Entity Name: Yale New Haven Health
Entity Type: Healthcare Provider
Industry: Healthcare
Location: New Haven, Connecticut, USA
Customers Affected: 5,556,702 individuals

Incident Response Plan Activated: True
Third Party Assistance: Mandiant (Cybersecurity Firm).
Containment Measures: mitigation efforts by digital and technology solutions team
Remediation Measures: rebuilding access to programs
Recovery Measures: restoring full system access
Communication Strategy: public statementupdates to staff and patients as appropriate

Incident Response Plan Activated: Yes (quick identification and containment)
Containment Measures: Unspecified (successful containment per YNHHS statement)
Communication Strategy: Public statement (2023-04-11)Detailed explanation (2023-04-11)Settlement announcement (2024-09-10)
Enhanced Monitoring: Committed to strengthening data security measures post-breach

Communication Strategy: Public disclosure
Incident Response Plan: The company's incident response plan is described as Yes (quick identification and containment).
Third-Party Assistance: The company involves third-party assistance in incident response through Mandiant (cybersecurity firm), .

Type of Data Compromised: Demographic information, Social security numbers, Patient type, Medical record numbers
Sensitivity of Data: High (PII, including SSNs)
Data Exfiltration: Yes
Personally Identifiable Information: Yes (Social Security numbers, medical record numbers)

Type of Data Compromised: Protected health information (phi)
Number of Records Exposed: 5,556,702
Sensitivity of Data: High
Personally Identifiable Information: Yes (PHI includes PII)
Prevention of Data Exfiltration: The company takes the following measures to prevent data exfiltration: rebuilding access to programs, .
Handling of PII Incidents: The company handles incidents involving personally identifiable information (PII) through by mitigation efforts by digital and technology solutions team, and unspecified (successful containment per ynhhs statement).
Data Recovery from Ransomware: The company recovers data encrypted by ransomware through restoring full system access, .

Regulatory Notifications: federal authorities (unspecified)

Legal Actions: Class action lawsuit (filed 2023-04-16), Settlement agreement (preliminary approval 2024-09-10),

Regulations Violated: HIPAA (likely),
Ensuring Regulatory Compliance: The company ensures compliance with regulatory requirements through Class action lawsuit (filed 2023-04-16), Settlement agreement (preliminary approval 2024-09-10), .

Lessons Learned: Importance of timely patient notification and adherence to industry-standard data security protocols to prevent and detect cyberattacks.

Recommendations: Enhance cybersecurity protocols beyond industry best practices, Implement faster breach notification processes, Regularly update and audit data security measuresEnhance cybersecurity protocols beyond industry best practices, Implement faster breach notification processes, Regularly update and audit data security measuresEnhance cybersecurity protocols beyond industry best practices, Implement faster breach notification processes, Regularly update and audit data security measures
Key Lessons Learned: The key lessons learned from past incidents are Importance of timely patient notification and adherence to industry-standard data security protocols to prevent and detect cyberattacks.
Implemented Recommendations: The company has implemented the following recommendations to improve cybersecurity: Implement faster breach notification processes, Regularly update and audit data security measures and Enhance cybersecurity protocols beyond industry best practices.

Source: Stream Connecticut News
Date Accessed: 2023-10-16T00:00:00Z

Source: Yale Daily News

Source: YNHHS Public Statement (2023-04-11)

Source: Class Action Lawsuit Settlement (filed 2024-09-10)
Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: Stream Connecticut NewsDate Accessed: 2023-10-16T00:00:00Z, and Source: Yale Daily News, and Source: YNHHS Public Statement (2023-04-11), and Source: Class Action Lawsuit Settlement (filed 2024-09-10).

Investigation Status: ongoing (with Mandiant)

Investigation Status: Ongoing (settlement pending final approval on 2026-03-03)

Investigation Status: Disclosed (ongoing or completed not specified)
Communication of Investigation Status: The company communicates the status of incident investigations to stakeholders through Public Statement, Updates To Staff And Patients As Appropriate, Public Statement (2023-04-11), Detailed Explanation (2023-04-11), Settlement Announcement (2024-09-10) and Public disclosure.

Stakeholder Advisories: Public Apology For Inconvenience, Request For Patience From Staff, Patients, And Community.
Customer Advisories: updates provided to patients as appropriate

Stakeholder Advisories: Settlement notices sent to affected patients; claim filing deadline: 2026-01-19
Customer Advisories: Reimbursement up to $5,000 for documented lossesCash payment option (~$100)

Customer Advisories: Public notification of breach
Advisories Provided: The company provides the following advisories to stakeholders and customers following an incident: were Public Apology For Inconvenience, Request For Patience From Staff, Patients, And Community, Updates Provided To Patients As Appropriate, , Settlement notices sent to affected patients; claim filing deadline: 2026-01-19, Reimbursement Up To $5,000 For Documented Losses, Cash Payment Option (~$100), and Public notification of breach.

High Value Targets: Patient Demographic Data, Social Security Numbers,
Data Sold on Dark Web: Patient Demographic Data, Social Security Numbers,

Root Causes: Alleged Failure To Implement Industry-Standard Data Security Protocols (Per Lawsuit), Delayed Patient Notification (Per Lawsuit),
Corrective Actions: $18 Million Settlement Fund, Enhanced Data Security Measures (As Part Of Injunctive Relief), Continuous System Updates To Prevent Future Breaches,
Post-Incident Analysis Process: The company's process for conducting post-incident analysis is described as Mandiant (Cybersecurity Firm), , Committed to strengthening data security measures post-breach.
Corrective Actions Taken: The company has taken the following corrective actions based on post-incident analysis: $18 Million Settlement Fund, Enhanced Data Security Measures (As Part Of Injunctive Relief), Continuous System Updates To Prevent Future Breaches, .
Last Attacking Group: The attacking group in the last incident was an Unauthorized third party.
Most Recent Incident Detected: The most recent incident detected was on 2023-10-14T00:00:00Z.
Most Recent Incident Publicly Disclosed: The most recent incident publicly disclosed was on 2023-04-11.
Highest Financial Loss: The highest financial loss from an incident was $18 million (settlement fund, including $6 million for attorney fees).
Most Significant Data Compromised: The most significant data compromised in an incident were Demographic information, Social Security numbers, Patient type, Medical record numbers, , Protected Health Information (PHI) and .
Most Significant System Affected: The most significant system affected in an incident was IT servicesinternet connectivityapplication accessphone systems.
Third-Party Assistance in Most Recent Incident: The third-party assistance involved in the most recent incident was mandiant (cybersecurity firm), .
Containment Measures in Most Recent Incident: The containment measures taken in the most recent incident were mitigation efforts by digital and technology solutions team and Unspecified (successful containment per YNHHS statement).
Most Sensitive Data Compromised: The most sensitive data compromised in a breach were Social Security numbers, Patient type, Demographic information, Medical record numbers and Protected Health Information (PHI).
Number of Records Exposed in Most Significant Breach: The number of records exposed in the most significant breach was 5.6M.
Most Significant Legal Action: The most significant legal action taken for a regulatory violation was Class action lawsuit (filed 2023-04-16), Settlement agreement (preliminary approval 2024-09-10), .
Most Significant Lesson Learned: The most significant lesson learned from past incidents was Importance of timely patient notification and adherence to industry-standard data security protocols to prevent and detect cyberattacks.
Most Significant Recommendation Implemented: The most significant recommendation implemented to improve cybersecurity was Implement faster breach notification processes, Regularly update and audit data security measures and Enhance cybersecurity protocols beyond industry best practices.
Most Recent Source: The most recent source of information about an incident are Stream Connecticut News, Class Action Lawsuit Settlement (filed 2024-09-10), YNHHS Public Statement (2023-04-11) and Yale Daily News.
Current Status of Most Recent Investigation: The current status of the most recent investigation is ongoing (with Mandiant).
Most Recent Stakeholder Advisory: The most recent stakeholder advisory issued was public apology for inconvenience, request for patience from staff, patients, and community, Settlement notices sent to affected patients; claim filing deadline: 2026-01-19, .
Most Recent Customer Advisory: The most recent customer advisory issued were an updates provided to patients as appropriate, Reimbursement up to $5,000 for documented lossesCash payment option (~$100) and Public notification of breach.
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