A third-party vendor that provides health care services has faced a major breach, potentially exposing the personal and medical information of more than a million Americans.
breach, chosen ones as a hacking/IT case by the United States Office of Human Rights, affects 1,261,464 Americans after hackers gained access to Medical Computer Business Services (MCBS) computers.
The company he says discovered an unauthorized access to its system in September 2025, which allowed hackers to steal data, which could including names, addresses, Social Security numbers, dates of birth, health plan beneficiary numbers, health insurance numbers or enrollment identification numbers and other medical records.
“When we heard about this matter, we immediately began a quick and thorough investigation. As part of our investigation, we have been working with cyber security experts who are familiar with this type of information. After a thorough legal investigation and review of all documents, we discovered on or about May 28, 2026, that some files containing your information were not accessed between September 2. 2025 and September 26, 2025.
MCBS works as a business partner that manages the administrative, financial and back office services for hospitals, special events and medical groups.
The company said it had immediately notified affected people while providing security access as a precautionary measure. So far, MCBS says it has not seen any misuse of victim or health information.
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