University of Hawaiʻi Cancer Center Ransomware Attack and Data Breach
A ransomware attack on the University of Hawaiʻi Cancer Center's Epidemiology Division compromised the personal information of approximately 1.2 million individuals. The stolen data includes names, Social Security numbers, driver's license information, voter registration records, and health-related information. The incident was discovered on August 31, 2025, and affected servers supporting research operations, though clinical operations, patient care, and student records were not impacted. The university engaged with the threat actors and paid a ransom to obtain decryption tools and assurances of data destruction. Notifications to affected individuals were delayed until early 2026.
Uhcancercenter
- Domain
- uhcancercenter.org
- Sector
- Health Care and Social Assistance
- Signals
- 1 linked
Signal context
First seen: Aug 31, 2025
Last updated: Jun 25, 2026
Status: Public signal
Key points
- Ransomware attack targeted the Epidemiology Division servers.
- Approximately 1.2 million individuals were affected.
- Compromised data includes names, Social Security numbers, driver's license information, voter registration records, and health-related information.
Signal analysis
BetaThis analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.
Sector: Health Care and Social Assistance
Likely country: Location not provided
Watch ransomware, endpoint compromise and business interruption exposure.
- Source type: outside the affected organization
Impact area: Confidentiality, Availability
Likely asset: User or customer data
- 6 signals in the same sector
- 100 signals with the same likely impact area
- 1 signal linked to this organization/domain
External sources
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