Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Cierant

Disclosed Jul 3, 2025232,506 affectedConfirmed

Official notice

What is known

People affected232,506 (as reported to HHS)
DisclosedJul 3, 2025
DiscoveredDec 10, 2024
HappenedDec 9, 2024
AttackRansomware
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Cierant
Official noticeatg.wa.gov
Washington Attorney General breach notice: Cierant
Official noticeocrportal.hhs.gov
HHS OCR breach report: Cierant (Business Associate, CT)

Notices filed

TotalJul 3, 2025
HHS OCR232,506 people
Residents of CAJul 7, 2025
California AGCount not stated
Residents of WAJul 7, 2025
Washington AG530 people
Residents of WAJul 7, 2025
Washington AG902 people
History of this record
data_types2026-09-25
[] to ["names","health"]by backfillSource
records_basis2026-09-25
empty to hhsby backfillSource
records2026-09-25
empty to 232506by backfillSource
disclosed2026-09-25
2025-07-07 to 2025-07-03by backfillSource
sector2026-09-25
other to healthby backfillSource
attack2026-09-25
unknown to ransomwareby backfillSource
discovered2026-09-25
empty to 2024-12-10by 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 Cierant