Copenhagen University breach exposes data of 525,000 people

The University of Copenhagen confirmed that hackers accessed a test environment containing personal data belonging to 525,000 people. The university detected the breach on Tuesday, 20 October 2026, and disclosed it on Friday, 23 October.

In an update on 26 October, the university added that PIN codes belonging to a further 20,000 staff and students had been exposed. The supplied information does not specify how the attackers gained access or whether they used the exposed data.