Northfield Bank — May 2023 breach

Clustered 7 filings across 5 jurisdictions · filing window Sep 7, 2023 → Oct 2, 2023. View entity profile → Other incidents for this victim →

⚠ 2 cross-filing discrepancies →Merge100%

Determination

Confirmed

Members

7 filings

States

Affected · reported

10,106

First → last filing

Sep 7, 2023 → Oct 2, 2023

Merge confidence

100%

incident inc_d617279e5dcc49f1 · merged by deterministic · confidence 100%

Part of the Progress Software Corporation supply-chain incident (2023) — at least 97 organizations filed notifications naming this third party.

Confirmed breach. Merged as one breach: 7 regulatory filings. The filings describe a third-party compromise. Intrusion May 7, 2023–May 31, 2023, discovered Aug 4, 2023 — the first regulatory filing landed 34 days later. 10,106 individuals reported across the linked filings. Data reported: Government ID, Identity (basic), Financial account, and 2 more. Notifications rolled out on a 25-day schedule across 7 filings beginning Sep 7, 2023. Each member filing remains the legal record for its jurisdiction.

Litigation Timing

Supplemental

Notification delay

34days

Discovered → first regulatory filing

Discovery variance

4days

Range of discovered_at dates across filings

Filing span

25days

Time between earliest and latest filing

Not recorded for this incident

Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster.

Regulatory clocksVermont⏱ VT AG >14 bdayMaine✓ ME AG ≤30d · 30dMassachusetts✓ MA credit monitoring dueFull clock table in Litigation Timeline

No cross-filing comparison data available for this incident.

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