HackingFinancial ServicesFinanceStolen CredentialsCustomer Data InvolvedTargetedFinancial accountGovernment IDPCIMediumContained

MutualOne Bank

bd_957c46807c5a3ec6 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Apr 30, 2026

To disclose

—

Affected

Not disclosed

Confidence

68%

Full breach record for MutualOne Bank →69 incidents on file

MutualOne Bank notified Massachusetts residents of a debit card fraud incident involving unauthorized transactions on customer accounts. The bank investigated the fraudulent charges, credited the affected accounts, and issued replacement debit cards with new numbers. The notification advises customers to monitor statements, place fraud alerts or security freezes on credit reports, and contact credit bureaus.

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Incident timeline — partial

? — ?

Breach window unknown

Apr 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.Confirmed13 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: Financial accountGovernment 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 account via debit card
Credited account for fraudulent transactions
Issued replacement debit card with new card number at branch at no cost
Changes made: Recommends monitoring account statements for 12 to 24 months
Advises placing fraud alerts on credit reports
Advises placing 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/2026-672-mutual-one-bank-april-2026/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 30, 2026
Raw hash: 76dde01ab5282b15dc2bf3f062b28151d3133247563a5ee6624e7be5e0593281

Reporting entityMutualOne Bank

Victim entityMutualOne Bank

IncidentUnauthorized Access

Stated responseInvestigated three transactions charged to account via debit card

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov