University of Hawaii Cancer Center hit by ransomware attack
Incident
Summary
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University of Hawaii Cancer Center suffered a ransomware breach in August 2025 that exposed study-participant data and encrypted compromised systems. The incident affected a single research project and delayed restoration and investigation, while clinical operations and patient care were not impacted. Later review found 1990s-era files containing Social Security numbers for research participants, raising the sensitivity of the disclosure.
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Timeline
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03.03.2026 11:48 1 articles · 2mo ago
University of Hawaii notifies affected individuals after UHCC breach
Victim Impact UpdateOn February 23, 2026, the University of Hawaii Cancer Center sent notification letters to more than 87,000 people enrolled in the Multiethnic Cohort (MEC) Study and said it was notifying other potentially impacted individuals after the August 2025 ransomware breach, including about 900,000 email addresses and roughly 1.15 million people tied to historical driver's license and voter registration records with SSN identifiers.
Show sources
- UH Cancer Center data breach affects nearly 1.2 million people — www.bleepingcomputer.com — 03.03.2026 11:48
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12.01.2026 20:48 2 articles · 4mo ago
Ransomware breach encrypts Cancer Center systems
Exploitation ObservedA ransomware gang breached the University of Hawaii Cancer Center on August 31, 2025, encrypting compromised systems and stealing data tied to a single research project; the incident did not affect clinical operations or patient care.
Show sources
- University of Hawaii Cancer Center hit by ransomware attack — www.bleepingcomputer.com — 12.01.2026 20:48
- University of Hawaii Cancer Center hit by ransomware attack — www.bleepingcomputer.com — 12.01.2026 20:48
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12.01.2026 20:48 1 articles · 4mo ago
University of Hawaii discloses data theft and response steps
Initial DisclosureUniversity of Hawaii said it disconnected affected systems, engaged external cybersecurity experts, notified external stakeholders, sought a decryption tool and secure destruction of stolen information, and implemented endpoint protection software, system replacements, password resets, firewall software replacement, and third-party security audits; review also found 1990s-era research files containing Social Security numbers, and affected individuals had not yet been notified.
Show sources
- University of Hawaii Cancer Center hit by ransomware attack — www.bleepingcomputer.com — 12.01.2026 20:48