Social EngineeringFinancial ServicesFinancePhishingCustomer Data InvolvedPIIIdentity (basic)LowContained

EDUCATIONAL EMPLOYEES CREDIT UNION

bd_78e4ebc6abee40f3 · schema v1 · pii pii-v2

Severity

Low

Discovered

Dec 15, 2025

Filed

May 29, 2026

To disclose

24 weeks

Affected

81state residents only

Linked

5 filings

Confidence

68%

Full breach record for EDUCATIONAL EMPLOYEES CREDIT UNION →

Educational Employees Credit Union notified Montana residents of a cybersecurity incident on May 29, 2026. On December 15, 2025, an unauthorized individual accessed a single employee email account. The investigation determined that certain emails containing personal information were accessed or removed. No evidence of financial fraud or identity theft was found. The credit union offered two years of complimentary identity monitoring services through Kroll.

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Incident timeline

discovery → filing · 24 weeks / 165 days

Dec 15, 2025

Begins

Dec 15, 2025

Discovered

May 29, 2026

Filed

vs. sector median

+15 wks slower

This filing is one of 5 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Massachusetts State AGbd_15b461a85b8b7df72026-05-29Candidate
Nebraska State AGbd_4c3b656dd5b5443a2026-05-29Verified
California State AGbd_6b3e06557a4d06e62026-05-29Verified
Texas State AGbd_d4e3d38742b461e12026-06-01 · +3dVerified by operator

Name: EDUCATIONAL EMPLOYEES CREDIT UNION
norm: educational employees credit union

Name: EDUCATIONAL EMPLOYEES CREDIT UNION
norm: educational employees credit union
Industry: Financial Servicesllm

Discovered: Dec 15, 2025
Breach occurred: Dec 15, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 29, 2026
Affected individuals: 81state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing Link
Threat actor: External
Initial access: phishing_link

During the incident: Secured our email environment
Commenced a prompt and thorough investigation assisted by cybersecurity professionals
Changes made: Continually evaluate and modify our practices and internal controls to enhance the security and privacy of your personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 24 weeks(165 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Massachusetts State AGMay 29 · first

Nebraska State AGMay 29 · first

California State AGMay 29 · first

Montana State AGMay 29 · first · this page

Texas State AG+3d

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/2026/09/Consumer-notification-letter-35.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 29, 2026
Raw hash: 7cb1b93735c6b9d9ab7716655693ceb005989a54373f48ec3d6e3eb848b39dd2

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityEDUCATIONAL EMPLOYEES CREDIT UNION

Victim entityEDUCATIONAL EMPLOYEES CREDIT UNION

Incidentdiscovered Dec 15, 2025

Stated responseSecured our email environment

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov