HackingFinanceFinancial accountPCIPIILowContained

Mutual One Bank

bd_7d189a43eb71fd20 · schema v1 · pii pii-v1

Severity

Low

Discovered

—

Filed

Jul 30, 2026

To disclose

—

Affected

4state residents only

Confidence

67%

Full breach record for Mutual One Bank →373 incidents on file

Mutual One Bank notified Massachusetts residents of a fraudulent debit card transaction incident. The bank investigated illegitimate charges, confirmed fraud, credited affected accounts, and issued replacement debit cards with new numbers. The notification advises consumers to monitor statements, place fraud alerts or security freezes with credit bureaus, and report identity theft to the FTC.

J jump to incidentP pin to compareR raw source

Incident timeline — partial

? — ?

Breach window unknown

Jul 30, 2026

Filed

—

No filing yet · watching

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed4 affectedView incident

Name: Bank One
norm: bank one
Domain: bankone.mu

Name: Mutual One Bank
norm: mutual one bank

Discovered: —
Materiality determined: —
Notification sent: —
Affected individuals: 4state-resident count only
Data types: Financial accountPCIPII
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: ExternalFinancial
Initial access: valid_credentials

During the incident: Credited the account
Issued a replacement debit card with a new card number at the branch at no cost
Changes made: Continuing to monitor the effects of the data breach
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.mass.gov/doc/2026-1254-mutual-one-bank/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 30, 2026
Raw hash: b8721dd3ca5a1542e244c3e1d370aa070983794b0bee282d1fce573d33154e5f

Reporting entityBank One

Victim entityMutual One Bank

IncidentUnauthorized Access

Stated responseCredited the account

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov