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Major data breach at McLaren Health Care sees 743,000 patients affected - here's what we know
- A ransomware attack in July and August 2024 affected McLaren Health Care and Karmanos Cancer Institute, leading to a data breach involving 743,131 individuals' information.
- The hackers stole personal data like Social Security numbers, health insurance details, driver's license information, names, and medical data.
- Suspicious activity was initially detected on August 5, 2024, and after a nine-month review, the breach was publicly disclosed in May 2025.
- McLaren suffered system downtime, resulting in cancellations and rescheduling of surgeries, appointments, and treatments during the breach.
- The breach led to the manual handling of appointments and medication information by staff.
- McLaren confirmed the breach was due to a ransomware attack by an international group after initially omitting this information.
- This is not the first ransomware incident for McLaren, with a prior attack in July 2023 affecting 2.2 million individuals.
- Despite no evidence of misuse, affected individuals are offered free credit monitoring for a year and advised to remain vigilant for any suspicious activities on their accounts.
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