HackingHealthcareFinancial ServicesHealthcareStolen CredentialsCustomer Data InvolvedPHIHealth (basic)Identity (basic)Government IDMediumActive

Blue Cross and Blue Shield of Montana

bd_92a9475a1aed6128 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Feb 11, 2025

Filed

Apr 12, 2025

To disclose

9 weeks

Affected

163state residents only

Confidence

64%

Full breach record for Blue Cross and Blue Shield of Montana →

Blue Cross and Blue Shield of Montana notified members of unauthorized access to the Blue Access for Members portal between Nov 8, 2024, and Mar 5, 2025. The incident, discovered Feb 11, 2025, potentially exposed PHI including names, DOBs, SSNs, and medical records. Experian IdentityWorks is offered.

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Incident timeline

undetected · 95 days

discovery → filing · 9 weeks / 60 days

Nov 8, 2024

Begins

Feb 11, 2025

Discovered

Apr 12, 2025

Filed

vs. sector median

3 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed163 affectedView incident

Name: Blue Cross and Blue Shield of Montana
norm: blue cross and blue shield of montana

Name: Blue Cross and Blue Shield of Montana
norm: blue cross and blue shield of montana
Industry: HealthcarellmFinancial Servicesllm

Discovered: Feb 11, 2025
Breach occurred: Nov 8, 2024 – Mar 5, 2025
Undetected for: 95 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 163state-resident count only
Data types: PHIHealth (basic)Identity (basic)Government ID
Data elements: Date of birthMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Offering a complimentary one-year membership of Experian’s IdentityWorks
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(60 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/2025/04/Consumer-notification-letter-21.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 12, 2025
Raw hash: fc0ffb971a82a975868836cb27e1c7fdc1372d6cd404656ce8fe5687ec366ada

Reporting entityBlue Cross and Blue Shield of Montana

Victim entityBlue Cross and Blue Shield of Montana

Incidentdiscovered Feb 11, 2025

Stated responseOffering a complimentary one-year membership of Experian’s IdentityWorks

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov