HackingHealthcareHealthcareCustomer Data InvolvedPIIPHIIdentity (basic)Health (basic)MediumContained

Western Montana Mental Health Center

bd_302a8478f032d5e0 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 15, 2024

Filed

Jul 17, 2025

To disclose

44 weeks

Affected

43,089state residents only

Linked

8 filings

Confidence

65%

Full breach record for Western Montana Mental Health Center →2 incidents on file

Western Montana Mental Health Center notified Montana residents of a data security incident discovered on September 15, 2024. Unauthorized access to files containing PII and PHI was confirmed in May 2025. The FBI was notified, and affected individuals were offered identity protection services. No evidence of misuse was found.

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Incident timeline

discovery → filing · 44 weeks / 305 days

Sep 15, 2024

Discovered

Jul 17, 2025

Filed

vs. sector median

+33 wks slower

This filing is one of 8 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (7) · sorted by filing gap

Nebraska State AGbd_3e621ed6b0cebeef2025-07-17Verified
Vermont State AGbd_48f24baf2ecae00e2025-07-17Verified
Montana State AGbd_5dd79b9c22b6bdc72025-07-17Verified
Indiana State AGbd_6ec13e1ebb9b4d082025-07-17Verified

Show 3 more filings ↓up to 1d gap

Maine State AGbd_154ae35704eb43312025-07-18 · +1dVerified by operator
Massachusetts State AGbd_67a72bd7f639a7b72025-07-18 · +1dVerified
New Hampshire State AGbd_c165bdbada433eae2025-07-18 · +1dVerified

Name: Western Montana Mental Health Center
norm: western montana mental health center

Name: Western Montana Mental Health Center
norm: western montana mental health center
Industry: Healthcarellm

Discovered: Sep 15, 2024
Materiality determined: —
Notification sent: Jul 17, 2025
Affected individuals: 43,089state-resident count only
Data types: PIIPHIIdentity (basic)Health (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified the Federal Bureau of Investigation
Initial access: valid_credentials

During the incident: Initiated an investigation of the matter with the assistance of independent cybersecurity experts
Engaged a third-party data review team to conduct a comprehensive review of those files
Notified the Federal Bureau of Investigation and will cooperate with any resulting investigation
Offering you complimentary identity protection services through IDX
Implemented measures to enhance security and minimize the risk of a similar incident occurring in the future
Changes made: Implemented measures to enhance security and minimize the risk of a similar incident occurring in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 44 weeks(305 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 7 states

View merged incident ↗

Nebraska State AGJul 17 · first

Vermont State AGJul 17 · first

Montana State AGJul 17 · first

Indiana State AGJul 17 · first

Montana State AGJul 17 · first · this page

Maine State AG+1d

Massachusetts State AG+1d

New Hampshire State AG+1d

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/2025/08/Consumer-notification-letter-23.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 17, 2025
Raw hash: e3ebaa076078ea7a532806b71c2bdcf859b77a3ff61b194dd2f180a24c0ff5c0

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entityWestern Montana Mental Health Center

Victim entityWestern Montana Mental Health Center

Incidentdiscovered Sep 15, 2024

Stated responseInitiated an investigation of the matter with the assistance of independent cybersecurity experts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov