Madera Community Hospital

Summary

Madera Community Hospital discovered that hackers accessed its network for two days and likely exfiltrated files containing personal, financial, and medical information. After reviewing the potentially exposed data with external experts, the hospital began notifying affected individuals and reported to the Department of Health and Human Services that over 150,000 people were impacted. The compromised data included names, contact information, dates of birth, Social Security numbers, account credentials, financial account details, treatment and health insurance information, and limited biometric data, though not every record contained all elements. The hospital said there was no evidence the information was shared publicly, and the extortion group that had demanded a ransom later withdrew its demand, stating it did not wish to harm patients. The hospital worked with third‑party specialists to investigate the breach, strengthen its security, and coordinated with law enforcement.

Motives

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TTPs

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Description

Madera Community Hospital is a not‑for‑profit community healthcare provider that serves Madera County and the surrounding areas, offering emergency services, surgical services, acute care, diagnostic imaging, and specialized medical programs. In May 2025, hackers gained unauthorized access to the hospital’s network and remained inside the system for approximately two days. During this intrusion, the attackers likely exfiltrated certain files containing sensitive information. After identifying files that were potentially exfiltrated in the attack, the hospital engaged third‑party cybersecurity experts and a data‑review firm to conduct an analysis of the compromised data. The hospital stated in its incident notice that it received the results of the data‑review in April 2026. Following receipt of those results, the hospital began working to verify contact information for the individuals who might have been affected by the breach. This verification effort was intended to ensure that breach notifications could be sent accurately once the scope of the incident was confirmed.

The data that was compromised in the breach includes names, contact information, dates of birth, Social Security numbers, account credentials, financial account information, treatment and health insurance information, and limited biometric information. The hospital has clarified that not every affected individual had all of these data elements exposed, and it has not found any evidence that the exfiltrated information was shared or otherwise released publicly. In mid‑July 2026, Madera Community Hospital commenced notifying the potentially impacted individuals about the data breach and simultaneously informed the U.S. Department of Health and Human Services that 150,810 people were affected. The extortion group responsible for the attack initially demanded a ransom payment but later withdrew its demand, asserting that it did not wish to harm patients. Throughout the incident response, the hospital worked with third‑party experts to address the event, to perform an investigation into the unauthorized activity, and to further secure its systems. Additionally, the hospital notified law enforcement agencies about the breach as part of its response efforts.

Sources

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