Great Valley School District — October 2023 breach
Clustered 4 filings across 4 jurisdictions · filing window Nov 29, 2023 → Dec 19, 2023. View entity profile → Other incidents for this victim →
incident inc_85619c0fd56148f4 · merged by human · confidence 100%
Litigation Timing
Discovered → first regulatory filing
Range of discovered_at dates across filings
Days between the first leak-site claim and the first regulatory filing. Positive = the claim came first (public exposure before disclosure). Negative = the claim trailed the filing, so there was no pre-disclosure leak. Counts regulatory filings only — press coverage is not a regulatory disclosure.
Time between earliest and latest filing
Not recorded for this incident
Materiality delta · SEC filing delay — no SEC 8-K in this cluster.
Sensitive data
identity_governmentIncident timeline
Dashed segments are unestablished, not zero — they fill in as filings merge into this incident.
Member cascade — every filing about this breach
- NOV 29Leak sitemedusa postfirst filing · attacker claim · unverifiedoperator-confirmedday 0
- DEC 19VT AGVT AG noticeno count stated+20d
- DEC 19NH AGNH AG notice2 NH residentsoperator-confirmed+20d
- DEC 19MA AGMA AG noticemost recent · 6 MA residentsoperator-confirmed+20d
- Watching for additional filings — new sources merge into this incident automatically.
Roll-up facts — reconciled across members
- Breach window
- Oct 31, 2023 – Nov 10, 2023 VT AG
- Discovered
- Nov 10, 2023· 10d undetected VT AG + NH AG
- Data types
- Financial account · Identity (basic) · Government ID · PII VT AG + NH AG + MA AG
- Attack vector
- Unauthorized Access VT AG
Each fact cites the member filing that establishes it; when filings conflict, every value shows with its source.
Evidence ladder — rungs this incident occupies
Attacker assertion only. Establishes: claim date, group, alleged victim.
No press coverage linked yet.
Unlocks: discovery date, data types, affected count, compliance clock.
No SEC filing or victim statement yet.
Merge provenance
- Method
- human
- Confidence
- 1.00 · above the 0.85 auto-merge floor
- Reviewed
- operator-reviewed Aug 22, 2026 · at least one link edge was human-adjudicated
- Audit
- Every link edge records its method, confidence and model + prompt versions (100% is the strongest edge).
Merges are reversible — a wrong link can be detached with its audit trail intact. How merging works.
Filing velocity
Spread
20 days
Cadence
~1 / 6.7d
vs. multi-state median
2.5× slower
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. This page states only what the linked filings agree on; each filing's own account stays on its own record, linked from the timeline below.
The weekly clock on records like this one
The Disclosure Clock is a weekly briefing on what landed in the disclosure record, and the gap between the criminals' post and the regulator's filing — measured on the whole record, with the method shown.
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