GLOBALClaimed by LockBit 3.xFirst sightinglinked via multi-signal match · 100%
Posted to leak site Aug 9, 2023bd_5902367df54c38e4
El Cerrito is a city in Contra Costa County, California, United States, and forms part of the San Francisco Bay Area.
Clustered 3 filings across 2 jurisdictions · filing window Aug 9, 2023 → Apr 12, 2024. View entity profile → Other incidents for this victim →
incident inc_b827203b45cc4381 · merge_method deterministic · confidence 100%
Gap between first leak claim and first regulatory filing
Time between earliest and latest filing
Not recorded for this incident
Discovery variance · Materiality delta · SEC filing delay — no SEC 8-K in this cluster; needs two dated filings.
CA
Leak Site · State AG
Earliest sighting first · deep chronology in Litigation Timeline
Jun 1, 2023 → Jun 7, 2023
When the intrusion reportedly occurred, per the linked filings
El Cerrito is a city in Contra Costa County, California, United States, and forms part of the San Francisco Bay Area.
El Cerrito is a city in Contra Costa County, California, United States, and forms part of the San Francisco Bay Area.
The City of El Cerrito, California experienced unauthorized access to its network between June 1 and June 7, 2023. A cybersecurity firm was engaged to investigate. Affected files contained personal information including names and other data elements. Notification letters were sent to affected individuals in March 2024, approximately nine months after the incident. Complimentary Experian IdentityWorks credit monitoring was offered.
About this clustering
DisclosureLens links filings into incidents through layered matchers: deterministic rules (same source document, multistate filings of one breach, tight-window same-victim pairs), a weighted-similarity scorer for cross-source candidates, and an operator review queue for everything uncertain. Each link records its own method and confidence — shown per filing in the timeline below. The system defaults to NOT merging when uncertain, because a false merge (collapsing two unrelated breaches) is more harmful than a false split (showing related filings separately); uncertain pairs route to human review instead of auto-merging. Filing summaries shown in the timeline are AI-generated extracts — verify each against its linked source.