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• Advanced Diagnostic Imaging, P.C. d/b/a AdvancedHEALTH May 16, 2026 • [ data leak, ransomware, healthcare ] DragonForce listed AdvancedHEALTH on its leak site on May 16, 2026 and claimed to have stolen 390 GB of data, including 2.3 million lines of patient data, partner agreements, management, payroll, and HR files. Public reporting noted that AdvancedHEALTH had not confirmed the full scope of DragonForce's claim.
• Arbeitsgemeinschaft Wirtschaftlichkeitsprüfung Niedersachsen e.V. (Arwini) May 5, 2026 • [ ransomware, data exfiltration, health information ] Kairos ransomware actors attacked Arbeitsgemeinschaft Wirtschaftlichkeitsprfung Niedersachsen e.V. (Arwini), the prescription-review association for statutory health insurance prescriptions in Lower Saxony. Police confirmed Kairos was responsible, that ransomware was used to encrypt data, and that data exfiltration occurred. Potentially affected data included contact, health, and billing information for patients; more than 70,000 records may have been stolen, though the exact scope remained under investigation.
• Hong Kong Hospital Authority (Kowloon East Cluster) April 3, 2026 • [ data leak, unauthorized retrieval, patient data ] The Hospital Authority detected unauthorized retrieval and leakage of patient data from the Kowloon East Cluster on April 3, 2026, affecting more than 56,000 patients; internal checks did not indicate a cyberattack, and police and privacy regulators were notified.
• Lena Health December 15, 2025 • [ data leak, healthcare, insecure server ] AI digital helper Lena Health breach allegedly exposed sensitive Houston Methodist patient data on a dark web forum; access claimed via insecure server.
• Cegedim Santé December 1, 2025 • [ data leak, unauthorized access, healthcare ] Cegedim Sant said attackers illegally accessed or extracted patient data from its MLM software database after abnormal application requests were detected on doctors accounts. The exposed information came from patient administrative files, while structured medical records remained intact.
• Methodist Homes of Alabama and Northwest Florida October 2, 2024 • [ unauthorized access, healthcare data breach, network incident ] Methodist Homes of Alabama and Northwest Florida reported an incident involving unauthorized access to its network between October 2 and October 14, 2024. The organization notified HHS on January 30, 2025 that 908 patients were affected, and later notified the Maine Attorney Generals Office in October 2025 that the incident affected 25,579 individuals in total.