Springfield Public Schools — August 2026 breach
Clustered 3 records across 2 jurisdictions: 2 filings and 1 leak-site claim · filed Oct 13, 2026 (dated filings only). View entity profile → Other incidents for this victim →
incident inc_08141126bac24ffd · merged by human · confidence 100%
Litigation Timing
Range of discovered_at dates across filings
Not recorded for this incident
Leak precedence · Materiality delta · SEC filing delay · Filing span — no SEC 8-K in this cluster; needs two dated filings.
Sensitive data
identity_governmentIncident timeline
Dashed segments are unestablished, not zero — they fill in as filings merge into this incident. Filings without a recorded filing day, or recorded as filed before the breach they report began, are not placed on this rail.
Member cascade — every filing and leak-site claim in this incident
- SEP 1MA AGMA AG noticefiling day not on record · 10,000 MA residentsoperator-confirmed—
- SEP 15Leak siteinterlock postfirst record · attacker claim · unverifiedday 0
- OCT 13NH AGNH AG noticemost recent · 2 NH residentsauto-linked+28d
- Watching for additional filings — new sources merge into this incident automatically.
Roll-up facts — reconciled across members
- Breach window
- Aug 1, 2026 – Sep 30, 2026 MA AG
- Discovered
- Aug 1, 2026MA AGSep 5, 2026NH AGfilings disagree on discovery
- Data types
- Education · Financial account · Government ID · PII MA AG + NH AG
- Attack vector
- Unauthorized Access MA 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 Oct 6, 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.
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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