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44 disclosed this week · 26,355 on record

Gunster, Yoakley & Stewart

Disclosed Aug 4, 2023545,575 affectedConfirmed

Official notice

The business associate (BA), Gunster, Yoakley, & Stewart, reported that it experienced a cyber-attack that compromised the protected health information (PHI) of 42,077 individuals. The PHI involved included names, addresses, dates of birth, drivers’ license and Social Security numbers, claims information, diagnoses, lab results, and medications. The BA notified HHS, affected individuals, the media, and provided substitute notice on its website. In response to the breach, the CE provided complimentary credit monitoring services and implemented additional administrative, technical, and security safeguards.

What is known

People affected545,575 (as reported by the organization)
DisclosedAug 4, 2023
DiscoveredNov 27, 2022
HappenedNov 27, 2022
AttackHacking
Data exposedNamesGovernment IDsHealthInsuranceCredentials and tokens
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

History of this record
sector2026-09-25
other to healthby backfillSource
attack2026-09-25
unknown to hackingby backfillSource
summary2026-09-25
empty to The business associate (BA), Gunster, Yoakley, & Stewart, reported that it experienced a cyber-attack that compromised the protected health information (PHI) of 42,077 individuals. The PHI involved included names, addresses, dates of birth,by backfillSource
disclosed2026-09-25
2023-12-04 to 2023-08-04by backfillSource
Added2026-09-25
First recordedby backfillSource

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

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