MainStreet Bancshares, Inc.
bd_766723094ff84577 · schema v1 · pii pii-v1
Full breach record for MainStreet Bancshares, Inc. →MainStreet Bancshares, Inc. (MNSB) disclosed a data security incident involving a core banking vendor. MNSB was made aware in March 2025 that the vendor had been compromised; the compromised vendor system contained PII of approximately 4.65% of MNSB's customer base. MNSB's own systems were not compromised. The company ceased the vendor relationship, notified regulators, and began notifying affected customers on May 26, 2025. MNSB does not anticipate material financial impact.
J jump to incidentP pin to compareR raw source
Incident timeline — partial
? — ?
Breach window unknown
May 30, 2025
Filed
No interval is drawn: no breach start or discovery date is on record for this filing.
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.