DisclosureLens
Social EngineeringGovernmentGovernmentPhishingCustomer Data InvolvedIdentity (basic)Government IDPHIHealth (basic)MediumResolved

County of Contra Costa, California

bd_b8243893f78a4464 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

May 11, 2023

To disclose

—

Affected

Not disclosed

Confidence

66%

County of Contra Costa, California experienced an email phishing incident resulting in unauthorized access to two email accounts between September 19 and September 20, 2022. The attacker accessed emails and attachments containing names, Social Security numbers, driver's license numbers, government IDs, medical information, and health insurance information. The County secured the accounts, launched an investigation, implemented enhanced monitoring, and offered 12 months of Experian IdentityWorks to affected individuals.

Incident timeline

Sep 19, 2022

Begins

May 11, 2023

Filed

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.