1.2 Million Affected by University of Hawaii Cancer Center Data Breach

Hackers stole names, Social Security numbers, driver’s license information, voter registration records, and health-related information.

The personal information of approximately 1.2 million people was compromised in a ransomware attack at the University of Hawaiʻi Cancer Center.

The incident occurred on August 31, 2025, and affected servers supporting the center’s research operations, with no impact on clinical operations or patient care.

According to an incident notice the University of Hawaiʻi published last week, “the extensiveness of the encryption by the threat actors” made it difficult to restore the affected systems and assess the compromised data.

The university says it engaged with the threat actors “to protect the individuals whose sensitive information may have been compromised,” and that it obtained a decryption tool and ensured the destruction of exfiltrated data. The institution did not share details on the paid ransom.

Most of the compromised data, the university says, was ...