UnknownFinancial ServicesFinanceFinancial accountLow

Greenfield Cooperative Bank

bd_1e9d1db6a6620252 · schema v1 · pii pii-v1

Severity

Low

Discovered

—

Filed

Sep 5, 2025

To disclose

—

Affected

268state residents only

Confidence

95%

Full breach record for Greenfield Cooperative Bank →5 incidents on file

Greenfield Cooperative Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2025-09-05. 268 Massachusetts residents were affected.

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Incident timeline — partial

? — ?

Breach window unknown

Sep 5, 2025

Filed

No interval is drawn: no breach start or discovery date is on record for this filing.

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed268 affectedView incident

Name: Greenfield Cooperative Bank
norm: greenfield cooperative bank
Domain: greenfieldcoopbank.com

Name: Greenfield Cooperative Bank
norm: greenfield cooperative bank
Domain: greenfieldcoopbank.com
Industry: Financial Servicesregulator portal

Discovered: —
Materiality determined: —
Notification sent: —
Affected individuals: 268state-resident count only
Data types: Financial account
Data elements: Financial account number
Stated not affected: Social Security numberMedical informationDriver's licence numberPayment card number
The filing states these were not involved. Categories absent from both lists were not addressed either way.
Attack vector: Unknown

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/data-breach-report-2025/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 5, 2025
Raw hash: 17a634385a87e879875346412523ac245f6fa1d8bdd3b3526b2af79defea1a45

Reporting entityGreenfield Cooperative Bank

Victim entityGreenfield Cooperative Bank

IncidentUnknown

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov