HackingFinancial ServicesFinanceStolen CredentialsData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Fairmont Federal Credit Union

bd_21b07e63bef16c8e · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jan 23, 2024

Filed

Sep 11, 2025

To disclose

20 months

Affected

38state residents only

Linked

8 filings

Confidence

66%

Full breach record for Fairmont Federal Credit Union →

Fairmont Federal Credit Union notified affected individuals of a data security incident where unauthorized access occurred between September 30 and October 18, 2023. The credit union discovered the incident on January 23, 2024. Personal information including full names and government identifiers was accessed. The organization engaged forensic investigators and is offering complimentary Experian IdentityWorks membership to affected individuals.

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Leak gap clock✗ Leak >180d20 months discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 115 days

discovery → filing · 20 months / 597 days

Sep 30, 2023

Begins

Jan 23, 2024

Discovered

Sep 11, 2025

Filed

vs. sector median

+77 wks slower

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

A leak claim by black_basta about this victim predates this filing by 694 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siteblack_bastabd_3065b6789ce4ea202023-10-18 · +694dVerified

Regulatory filings (6) · sorted by filing gap

Maine State AGbd_0a31c3a936612f172025-09-11Verified
Nebraska State AGbd_2ad939cf43bf74292025-09-11Verified
Massachusetts State AGbd_548cd262e7012e8c2025-09-11Verified
California State AGbd_a6c06c435aa4a9612025-09-11Verified

Show 2 more filings ↓up to 7d gap

Texas State AGbd_296cd008c0de54c12025-09-12 · +1dVerified
New Hampshire State AGbd_761a3297a827ae362025-09-18 · +7dVerified

Name: Fairmont Federal Credit Union
norm: fairmont federal credit union
Domain: fairmontfcu.com

Name: Fairmont Federal Credit Union
norm: fairmont federal credit union
Domain: fairmontfcu.com
Industry: Financial Servicesllm

Discovered: Jan 23, 2024
Breach occurred: Sep 30, 2023 – Oct 18, 2023
Undetected for: 115 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 38state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Initial access: valid_credentials

During the incident: Commenced a prompt and thorough forensic investigation
Working very closely with external cybersecurity professionals
Offering complimentary access to Experian IdentityWorks
Changes made: Continually evaluate and modify our practices and internal controls to enhance the security and privacy of your information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 20 months(597 days from discovery to filing)
Compliance flags: Leak >180d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 7 filings · 7 states

View merged incident ↗

Maine State AGSep 11 · first

Nebraska State AGSep 11 · first

Massachusetts State AGSep 11 · first

California State AGSep 11 · first

Montana State AGSep 11 · first · this page

Texas State AG+1d

New Hampshire State AG+7d

Pattern: first filing Sep 11 (ME), last Sep 18 (NH) — a 7-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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/2025/09/Consumer-notification-letter-33.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 11, 2025
Raw hash: 6d3315b2eba6be7e10cf85faef4f37bdb85afec28f542ed0fc265e9c4751c145

Linked disclosures

Ransomware claims (1)

Regulatory filings (6) · sorted by filing gap

Reporting entityFairmont Federal Credit Union

Victim entityFairmont Federal Credit Union

Incidentdiscovered Jan 23, 2024

Stated responseCommenced a prompt and thorough forensic investigation

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancedojmt.gov