Another 5.4 Million Records Exposed: What the Episource Breach Teaches Us About Encryption‑in‑Use
This month’s major breach headline details how healthcare services firm Episource disclosed that threat actors exfiltrated sensitive data belonging to 5.4 million individuals, including names, Social Security numbers, dates of birth and medical details. While the disclosure by Episource—a subsidiary of UnitedHealth Group’s (UHG) Optum arm—arrived in mid‑July 2025, the incident traces back to a ransomware intrusion that began January 27, 2025 and remained undetected for ten days. Episource’s announcement follows a brutal year for UHG after the Change Healthcare mega‑breach exposed an estimated 190 million people. The latest event underscores a stubborn reality: as long as protected health information (PHI) can be viewed in plaintext during everyday processing, attackers will keep coming back. What Happened at Episource? According to the breach notice filed with the U.S. Department of Health & Human Services (HHS), the attackers gained access to Episource’s network between January 27 and February 6, 2025, siphoning off roughly 6 TB of PHI before deploying […]