University of California

Disclosed May 13, 2021547,422 accountsConfirmed

In December 2020, the University of California suffered a data breach due to vulnerability in in a third-party provider, Accellion . The breach exposed extensive personal data on both students and staff including 547 thousand unique email addresses, names, dates of birth, genders, social security numbers, ethnicities and other academic related data attributes. Further analysis is available in Exploring the Impact of the UC Data Breach . The data was provided to HIBP courtesy of Cyril Gorlla.

What is known

People affected	547,422 (accounts in the leaked data, per Have I Been Pwned)
Disclosed	May 13, 2021
Happened	Dec 24, 2020
Attack	Supply chain
Data exposed	Dates of birthEducation recordsEmailsEmploymentNamesPhone numbersAddressesGovernment IDs
Sector	Education · US
Status	Confirmed
Check your email	Have I Been Pwned

Sources

Official noticeoag.ca.gov

California Attorney General breach notice: University of California

Aggregatorhaveibeenpwned.com

Have I Been Pwned: University of California

Notices filed

Residents of CAMay 13, 2021

California AGCount not stated

Accounts in the dataJun 20, 2021

Have I Been Pwned547,422 people

History of this record

hibp2026-09-25

empty to UCby backfillSource

attack2026-09-25

unknown to supply-chainby backfillSource

data_types2026-09-25

[] to ["dob","education","emails","employment","names","phone","addresses","government-id"]by backfillSource

records_basis2026-09-25

empty to hibpby backfillSource

records2026-09-25

empty to 547422by backfillSource

summary2026-09-25

empty to In December 2020, the University of California suffered a data breach due to vulnerability in in a third-party provider, Accellion . The breach exposed extensive personal data on both students and staff including 547 thousand unique email aby backfillSource

Added2026-09-25

First recordedby backfillSource

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

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