HackingFinancial ServicesFinanceStolen CredentialsData ExfiltratedCustomer Data InvolvedGovernment IDIdentity (basic)MediumContained

Beacon Mutual Insurance

bd_ffd3dfb51f7f7e86 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jan 14, 2026

Filed

May 18, 2026

To disclose

18 weeks

Affected

646state residents only

Linked

11 filings

Confidence

66%

Full breach record for Beacon Mutual Insurance →

The Beacon Mutual Insurance Company notified the New Hampshire Attorney General of a cybersecurity incident affecting approximately 646 NH residents. Unauthorized access occurred between January 7 and January 14, 2026, resulting in the exfiltration of names and Social Security numbers. Beacon Mutual contained the incident, reported to law enforcement, and is offering credit monitoring services to affected individuals.

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
Montana State AGbd_88cdbba0a563b7f12026-05-18Verified
Vermont State AGbd_8abe1f6930c743e62026-05-18Verified by operator
California State AGbd_9212ea1e5259bdac2026-05-18Verified by operator

Show 4 more filings ↓up to 1d gap

Indiana State AGbd_96f08282e4c86e4a2026-05-18Verified by operator
Nebraska State AGbd_acbc06cd15404c7b2026-05-18Verified
Maine State AGbd_e4cb15dcb1bd517c2026-05-18Verified 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: 646state-resident count only
Data types: Government IDIdentity (basic)
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified New Hampshire Attorney General's Office
Initial access: valid_credentials

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
Established a dedicated, toll-free call center for individuals to call with questions
Offering involved individuals with a Social Security number and/or driver’s license involved a complimentary membership in credit monitoring and identity theft protection services through Experian
Changes made: Taken, and will continue to take, steps to enhance the security of their 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

Montana 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 · 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://mm.nh.gov/files/uploads/doj/remote-docs/beacon-mutual-insurance-20260518.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: 159fed4024adf13ec52754108ef8cc1dbc7bfc4e099f7dabed1ef0ecd39af1c5

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 provenancemm.nh.gov