AccidentalFinancial ServicesFinanceMisdeliveryCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumResolved

TrailWest Bank

bd_fa8b9d7941f8642a · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jan 6, 2026

Filed

Jan 7, 2026

To disclose

≤1 day

Affected

2state residents only

Confidence

65%

Full breach record for TrailWest Bank →2 incidents on file

TrailWest Bank notified Montana residents of a misdirected email incident on January 6, 2026. The email contained sensitive PII including SSNs, driver's license info, and loan numbers. The recipient was a trusted individual who permanently deleted the email. No ransomware or hacking involved.

J jump to incidentP pin to compareR raw source

Incident timeline

discovery → filing · ≤1 day / 1 days

Jan 6, 2026

Discovered

Jan 7, 2026

Filed

vs. sector median

8 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed2 affectedView incident

Name: TrailWest Bank
norm: trailwest bank

Name: TrailWest Bank
norm: trailwest bank
Industry: Financial Servicesllm

Discovered: Jan 6, 2026
Materiality determined: —
Notification sent: Oct 29, 2025
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security numberDate of birth
Attack vector: Misconfiguration
MITRE ATT&CK: T1534 Internal Remote Services
Threat actor: External

During the incident: Commenced an investigation to confirm the nature and scope of the incident
Implemented additional safeguards
Reviewed policies and procedures relating to data privacy and security
Changes made: Implemented additional safeguards
Reviewed policies and procedures relating to data privacy and security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: ≤1 day(1 days from discovery to filing)
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://dojmt.gov/wp-content/uploads/2026/05/Consumer-notification-letter.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 7, 2026
Raw hash: af7288370b2845611479294c2335ba0bc97519c52b36a9a82983103236f6dd3a

Reporting entityTrailWest Bank

Victim entityTrailWest Bank

Incidentdiscovered Jan 6, 2026

Stated responseCommenced an investigation to confirm the nature and scope of the incident

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov