The U.S. healthcare services business Welltok revealed a data breach that affected around 8.5 million patients. The business was one among the targets of a widespread hacking campaign that took advantage of a zero-day vulnerability in the MOVEit Transfer programme. The exposed information includes patient information, including phone numbers, physical addresses, email addresses, and full names. Threat actors also obtained specific health insurance details, Medicare/Medicaid ID numbers, and Social Security numbers (SSNs) for some of the affected individuals. The following organisations, on behalf of which Welltok is delivering notice to affected individuals, are Asuris Northwest Health, BridgeSpan Health, Blue Cross and Blue Shield of Minnesota, Blue Cross and Blue Shield of Alabama, Blue Cross and Blue Shield of Kansas, Blue Cross and Blue Shield of North Carolina, Corewell Health, Faith Regional Health Services, Mass General, Brigham Health Plan, Priority Health, Regence BlueCross BlueShield of Oregon, Regence BlueShield, Regence BlueCross BlueShield of Utah, Regence Blue Shield of Idaho, St. Bernards Healthcare, and Sutter Health.

On November 13, 2023, the Maine Office of the Attorney General reported that St. Bernards Healthcare, Inc. experienced a data breach involving unauthorized access to their MOVEit Transfer server on May 30, 2023. The breach affected approximately 89,556 individuals, revealing data including names, Social Security numbers, dates of birth, and health information. Welltok, Inc. is providing 24 months of credit monitoring services to those affected.