DisclosureLens
UnknownEducationEducationGovernment IDMedium

Chester County Library System, PA

bd_8944629f97ee5ee0 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Nov 7, 2025

To disclose

—

Affected

5state residents only

Linked

2 filings

Confidence

95%
Full breach record for Chester County Library System, PA →2 incidents on file

Chester County Library System reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2025-11-07. 5 Massachusetts residents were affected.

Massachusetts clock✓ MA credit monitoring due
⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

Incident timeline — partial

? — ?

Breach window unknown

Nov 7, 2025

Filed

—

Corroborated · see linked filings

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

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.