Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Maximus

Disclosed Jun 18, 2021334,690 affectedConfirmed

Official notice

What is known

People affected334,690 (as reported by the organization)
DisclosedJun 18, 2021
DiscoveredMay 19, 2021
HappenedMay 17, 2021
AttackHacking
Data exposedNot stated
SectorGovernment · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Maximus
Official noticeatg.wa.gov
Washington Attorney General breach notice: Maximus
Official noticejustice.oregon.gov
Oregon DOJ breach notice: Maximus
Official noticein.gov
Indiana Attorney General 2021 data breach report: Maximus

Notices filed

Residents of WAJun 18, 2021
Washington AG2,560 people
Residents of INJun 18, 2021
Indiana AG6,458 people
Residents of CAJun 23, 2021
California AGCount not stated
Residents of ORJun 23, 2021
Oregon DOJ334,690 people

Other breaches at Maximus

Insider breachInsider exposed names and health records. Reported to the HHS archive.4,955 affectedHealthcareUSApr 25, 2025MOVEit breach exposes personal and health data of 8 to 11 million peopleSupply chain exposed names, Social Security numbers and health records. Reported to the California AG.Supply chain9.2M affectedGovernmentUSJul 26, 2023
History of this record
sector2026-09-25
other to governmentby backfillSource
records_basis2026-09-25
empty to organizationby backfillSource
records2026-09-25
empty to 334690by backfillSource
attack2026-09-25
unknown to hackingby backfillSource
disclosed2026-09-25
2021-06-23 to 2021-06-18by backfillSource
discovered2026-09-25
empty to 2021-05-19by 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.

Everything about Maximus