HackingFinancial ServicesFinanceStolen CredentialsCustomer Data InvolvedTargetedIdentity (basic)Government IDPCIMediumContained

MutualOne Bank

bd_9ba2c7e8db3ef8c1 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Feb 27, 2026

To disclose

—

Affected

Not disclosed

Confidence

68%

Full breach record for MutualOne Bank →69 incidents on file

MutualOne Bank notified Massachusetts customers of fraudulent debit card transactions where unauthorized actors used valid credentials to charge illegitimate transactions. The bank investigated, credited affected accounts, and issued replacement cards. Customers were advised to monitor statements, contact credit bureaus, and place fraud alerts or security freezes.

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Incident timeline — partial

? — ?

Breach window unknown

Feb 27, 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.Confirmed12 affectedView incident

Name: MutualOne Bank
norm: mutualone bank
Domain: mutualone.mymortgage-online.com

Name: MutualOne Bank
norm: mutualone bank
Domain: mutualone.mymortgage-online.com
Industry: Financial Servicesllm

Discovered: —
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDPCI
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: ExternalFinancial
Initial access: valid_credentials

During the incident: Investigated three transactions charged to customer's debit card
Credited customer's account for fraudulent transactions
Issued replacement debit card with new card number at branch at no cost
Changes made: Recommended customers review account statements for 12-24 months
Advised customers to contact credit reporting agencies
Advised customers to place fraud alerts on credit files
Advised customers to place security freezes on consumer credit reports
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/2026-301-mutual-one-bank-february-2026/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 27, 2026
Raw hash: 54d3fc79eb4c13eca305023806365e94e1897ad1eedb6c2731dd17ce3edf9ea7

Reporting entityMutualOne Bank

Victim entityMutualOne Bank

IncidentUnauthorized Access

Stated responseInvestigated three transactions charged to customer's debit card

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov