Ransomware Breach at University of Hawaii Cancer Center Affects 1.2M People

The University of Hawaii Cancer Centre has confirmed a massive ransomware attack affecting 1.24 million people. Sensitive data, including Social Security numbers and historical voter records dating back to 1993, was compromised.

The University of Hawaii (UH) has confirmed that a major security breach at its Cancer Centre has significantly affected more people than first thought, with the total now reaching approximately 1.24 million individuals. The incident, which was first detected on 31 August 2025, involved a ransomware attack that targeted the centre’s research systems.

The university stated that the attack specifically hit servers belonging to its Epidemiology Division, and officials have been clear that this incident did not impact clinical operations, patient care, or student records.

Why was so much data taken?

The university’s official notice revealed that the breach involved two main groups of people. The first includes about 1.15 million individuals whose ...