US EditionYale New Haven Health alerts 5.5M+ patients of data breach
- Yale New Haven Health experienced a cybersecurity incident involving unauthorized third-party access to its network detected in early March 2025.
- The incident occurred after the health system detected unusual activity and follows a recent record year for healthcare sector cyberattacks.
- An investigation found the unauthorized party copied certain patient data, though it did not access electronic medical records or financial information.
- The breach exposed information for over 5.5 million people, including demographics, Social Security numbers, and medical record numbers.
- The health system is notifying affected individuals and offering credit monitoring for those with exposed Social Security numbers.
13 Articles
13 Articles
Data breach at Connecticut’s Yale New Haven Health affects over 5 million
A data breach at Connecticut’s largest healthcare system Yale New Haven Health affects more than 5.5 million people, according to a legally required notice with the U.S. government’s health department. Yale New Haven said the March cyberattack allowed malicious hackers to obtain copies of patients’ personally identifiable information and some healthcare-related data. Per a notice on the healthcare system’s website, the stolen data varies by per…
This Healthcare Data Breach Compromised 5.5 Million Patients' Information
Data breaches targeting healthcare and compromising patient information seem to be coming fast and furious, the latest of which occurred at Yale New Haven Health (YNHHS), a massive nonprofit healthcare network in Connecticut. Hackers stole the data of more than 5.5 million individuals during an attack in March 2025.
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