A third-party vendor providing services to healthcare companies has suffered a massive data breach, potentially exposing sensitive personal and medical information for more than 1 million Americans.
rags, classified Designated as a hacking/IT incident by the US Department of Health and Human Services Office for Civil Rights, it affected 1,261,464 Americans after hackers gained access to the computer network of Medical Computer Business Services (MCBS).
Company He says It discovered unauthorized access to its systems in September 2025, enabling attackers to steal data, which could happen. Includes Names, addresses, Social Security numbers, dates of birth, health plan beneficiary numbers, health insurance policy numbers or participant identification numbers, and other medical records.
“Upon learning of this issue, we immediately began a rapid and thorough investigation. As part of our investigation, we have been working very closely with external cybersecurity professionals experienced in handling these types of incidents. After an extensive forensic investigation and comprehensive document review, we discovered on or about May 28, 2026, that certain files containing your personal information may have been subject to unauthorized acquisition between September 22, 2025 and September 26, 2025.” “Almost.”
MCBS acts as a business partner that handles administrative, financial and back-end operations for hospitals, private practices and medical groups.
The company says it has notified affected individuals out of the blue while offering free access to identity protection services as a precaution. At this time, MCBS says it has not witnessed any misuse of personal or health information of affected individuals.
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