HackingFinancial ServicesFinanceCustomer Data InvolvedPIIIdentity (basic)Government IDMediumContained

Beacon Mutual Insurance

bd_88cdbba0a563b7f1 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Jan 14, 2026

Filed

May 18, 2026

To disclose

18 weeks

Affected

35state residents only

Linked

11 filings

Confidence

68%

Full breach record for Beacon Mutual Insurance →

The Beacon Mutual Insurance Company notified Montana residents of a data security incident where unauthorized access occurred between Jan 7-14, 2026. The company discovered the activity on Jan 14, 2026, and confirmed on Apr 16, 2026, that personal information (including SSN and driver's license numbers) was accessed. Notices were sent on May 18, 2026, offering 3 years of Experian IdentityWorks. Law enforcement was notified.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >90d18 weeks 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 · 7 days

discovery → filing · 18 weeks / 124 days

Jan 7, 2026

Begins

Jan 14, 2026

Discovered

May 18, 2026

Filed

vs. sector median

+8 wks slower

This filing is one of 11 about the same incident.View merged incident

A leak claim by inc_ransom about this victim predates this filing by 124 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (2)

Leak Siteinc_ransombd_da7048f19e46b32f2026-01-31 · +107dVerified by operator
Leak Siteinc_ransombd_5b90158bd9f951672026-01-14 · +124dVerified by operator

Regulatory filings (8) · sorted by filing gap

Massachusetts State AGbd_5d7dc416180d53c82026-05-18Verified by operator
Vermont State AGbd_8abe1f6930c743e62026-05-18Verified by operator
California State AGbd_9212ea1e5259bdac2026-05-18Verified by operator
Indiana State AGbd_96f08282e4c86e4a2026-05-18Verified by operator

Show 4 more filings ↓up to 1d gap

Nebraska State AGbd_acbc06cd15404c7b2026-05-18Verified
Maine State AGbd_e4cb15dcb1bd517c2026-05-18Verified by operator
New Hampshire State AGbd_ffd3dfb51f7f7e862026-05-18Verified by operator
Texas State AGbd_a561b8d222dfacc42026-05-19 · +1dVerified

Name: Beacon Mutual Insurance
norm: beacon mutual insurance
Domain: beaconmutual.com

Name: Beacon Mutual Insurance
norm: beacon mutual insurance
Domain: beaconmutual.com
Industry: Financial Servicesllm

Discovered: Jan 14, 2026
Breach occurred: Jan 7, 2026 – Jan 14, 2026
Undetected for: 7 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 18, 2026
Affected individuals: 35state-resident count only
Data types: PIIIdentity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1119 Automated Collection
Threat actor: External
Regulator citations: reported the incident to law enforcement
Initial access: exploit_public_facing

During the incident: Took action to contain it
Began an investigation
Reported the incident to law enforcement
Undertook a comprehensive and time-intensive review of the involved files
Offering you a free 3-year membership with Experian IdentityWorks
Changes made: Steps to enhance the security of our computer network
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 18 weeks(124 days from discovery to filing)
Compliance flags: Leak >90d
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 · 9 filings · 9 states

View merged incident ↗

Massachusetts State AGMay 18 · first

Vermont State AGMay 18 · first

California State AGMay 18 · first

Indiana State AGMay 18 · first

Nebraska State AGMay 18 · first

Maine State AGMay 18 · first

New Hampshire State AGMay 18 · first

Montana State AGMay 18 · first · this page

Texas 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/2026/09/Consumer-notification-letter-16.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 18, 2026
Raw hash: 5f7781c7b692a8abb61356412cc1907474251069aa1522699a1766e2f94bf556

Linked disclosures

Ransomware claims (2)

Regulatory filings (8) · sorted by filing gap

Reporting entityBeacon Mutual Insurance

Victim entityBeacon Mutual Insurance

Incidentdiscovered Jan 14, 2026

Stated responseTook action to contain it

ComplianceLeak >90d

Extraction provenanceno artifact recorded

Source provenancedojmt.gov