UCLA Health cyberattack involved sensitive data on 4.5 million people

A hack targeting UCLA Health’s computer network may have exposed personal and medical data on 4.5 million people.

The attack tapped into parts of the system where sensitive details like names, birth dates and health plan identification numbers are kept, though there’s no evidence yet that the information was “actually accessed or acquired,” UCLA Health said Friday.

UCLA Health, which operates four hospitals in the Los Angeles area, noticed strange activity on its network in October. UCLA Health and the FBI looked into the incident and initially believed attackers had not accessed network servers that stored personal data.

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