2025 Hacking incident — 5.5M patients
Data compromised
Names, birthdates, phone numbers, addresses, email, race/ethnicity, medical record numbers, Social Security numbers
Technical writeup
Connecticut's largest healthcare provider reported unauthorized access discovered March 8, 2025. Largest healthcare breach reported in 2025. Exposed data included names, birthdates, phone numbers, addresses, email, race/ethnicity, medical record numbers, and Social Security numbers.
Root cause
Hacking; unauthorized access to systems.