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Structured extracts of public breach disclosures — regulator filings (SEC, HHS, state AGs, EU DPAs) alongside threat-actor leak-site claims and press reports. SEC and HHS filings render inline from the originating regulator’s public record under the fair report privilege; other sources link out to the source URL. AI-extracted with full per-record audit trail (model, prompt version, confidence).

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Chester County Library System, PA data breach (2025) · DisclosureLens

All incidents View linkage analytics →

Incident · single filing

Chester County Library System, PA

One linked filing — more sources may join as they report · filed Oct 28, 2025. View entity profile → Other incidents for this victim →

Confirmed breach. Intrusion Sep 13, 2025, discovered Oct 17, 2025 — the first regulatory filing landed 11 days later. 1,281 individuals reported across the linked filings.

incident inc_8bcf906c3ec4422a · merge_method deterministic

Litigation Timing

Notification delay

11days

Discovered → first regulatory filing

Not recorded for this incident

Discovery variance · Leak precedence · Materiality delta · SEC filing delay · Filing span — no leak-site claim in this cluster; no SEC 8-K in this cluster; needs two dated filings.

Regulatory clocksMaine✓ ME AG ≤30d · 11dFull clock table in Litigation Timeline

State AGConfirmedLifecycle stage 2 of 3: ConfirmedUnverified claimConfirmedEnforced

Affected (total reported)

1,281

Data types

—

Jurisdictions

1

ME

Linked filings

1

all State AG

Timeline

Earliest sighting first · deep chronology in Litigation Timeline

Breach window
Sep 13, 2025
When the intrusion reportedly occurred, per the linked filings
34 days
Breach discovered
Oct 17, 2025
Reported by MAINE AG filing
🦞Maine State AGFirst filing
Filed Oct 28, 2025bd_19412a253040ab1e
Chester County Library System experienced a data breach due to an external system breach (hacking) affecting 1281 individuals, including 1 Maine resident.
Affected (this filing): 1,281
ME AG ≤30d · 11d

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.