HackingEducationMedium
Chester County Library System, PA
bd_19412a253040ab1e · schema v1 · pii pii-v1
Full breach record for Chester County Library System, PA →2 incidents on fileChester County Library System experienced a data breach due to an external system breach (hacking) affecting 1281 individuals, including 1 Maine resident.
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Maine clockDiscovered Oct 17, 2025 → Filed with AG Oct 28, 202511d ✓ ME AG ≤30d11 days discovery → filing
⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.
Incident timeline
undetected · 34 days
discovery → filing · 11 days
Sep 13, 2025
Begins
Oct 17, 2025
Discovered
Oct 28, 2025
Filed
Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1,281 affectedView 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.