MAINSTREET FEDERAL CREDIT UNION
bd_8d3fdafae2c42fb4 · schema v1 · pii pii-v1
Full breach record for MAINSTREET FEDERAL CREDIT UNION →Mainstreet Federal Credit Union notified Massachusetts residents of a data security incident involving unauthorized access to customer information, likely via a phishing attack targeting the credit union's email environment. The incident compromised personal data, and the credit union has enhanced its email security measures.
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Incident timeline — partial
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Breach window unknown
Jun 18, 2026
Filed
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Corroborated · see linked filings
Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.
Linked disclosures
Why this link?Regulatory filings (3) · sorted by filing gap
- New Hampshire State AGbd_dc1bebca2267480f2026-06-18Verified
- Indiana State AGbd_95a5aa203651f1602026-05-04 · +45dCandidate
- Nebraska State AGbd_a7b719418247207b2026-05-04 · +45dVerified
Filing propagation · 4 filings · 4 states
View merged incident ↗Pattern: first filing May 4 (IN), last Jun 18 (MA) — a 45-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?
Evidence ladder
Attacker assertion only. Establishes: claim date, group, alleged victim.
Unlocks: incident narrative, operational impact. Still no compliance clock.
Unlocks: discovery date, data types, affected count, compliance clock.
Unlocks: materiality, stated response, full audit trail. Ceiling removed.