- CMH breach exposed PII of 145,381 patients and employees in March 2025
- The stolen data includes names, social security numbers, health insurance and treatment information.
- No actor claimed responsibility; Victims were offered credit monitoring and support services.
The data breach incident that occurred at Central Maine Healthcare (CMH) in the spring of 2025 affected more than 145,000 people, who may have lost personally identifiable information (PII) to unidentified hackers.
The organization confirmed the news in a data breach notification letter sent to all affected individuals, noting that the cyberattack occurred in late March and was detected in June 2025.
After ejecting the intruders, CMH launched an investigation to determine what happened and what the damage was, which concluded on November 6, 2025, when CMH realized that confidential data from exactly 145,381 people had been stolen.
Data yet to emerge
The stolen data included individual names, dates of birth, treatment information, dates of service, provider names, health insurance information, and Social Security numbers (SSN). Both employees and patients were said to have been affected by this violation.
“For patients whose information may have been involved in the incident, Central Maine Healthcare recommends that they review the statements they receive from their healthcare providers and health insurance plans,” the organization said. “If they see any services that were not received, they should contact the provider or health plan immediately.”
As is common practice in these situations, CMH offers free credit and identity theft monitoring services, as well as a dedicated support line where victims can get answers, report abuse, and discuss potential concerns.
As of press time, no threat actors have claimed responsibility for this attack, and the stolen data has yet to appear anywhere on the dark web. Criminals are more likely to use it in phishing attacks or sell it to another actor.
Central Maine Healthcare is a nonprofit, integrated health care delivery system serving approximately 400,000 residents in central, western and midcoast Maine.
It operates three hospitals: Central Maine Medical Center in Lewiston, Bridgton Hospital and Rumford Hospital, as well as a large primary and specialty care network with more than 600 physicians and advanced practice professionals in more than 40 locations. Its services include trauma care, cardiovascular and oncology treatment, and LifeFlight helicopter service.
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