HackingHealthcareFinancial ServicesHealthcareCustomer Data InvolvedIdentity (basic)Government IDHighContained

Teamsters Union 25 Health Services & Insurance Plan

bd_dbae3845904e78bc · schema v1 · pii pii-v1

Severity

High

Discovered

Aug 1, 2025

Filed

Sep 3, 2025

To disclose

5 weeks

Affected

1,521state residents only

Linked

6 filings

Confidence

67%

Full breach record for Teamsters Union 25 Health Services & Insurance Plan →

Teamsters Union 25 Health Services & Insurance Plan (HSIP) notified the New Hampshire Attorney General of a data security event occurring on or about August 1, 2025. Unauthorized access to HSIP's network resulted in the potential copying of names and Social Security numbers for 1,521 New Hampshire residents. HSIP engaged third-party specialists, isolated the network, and mailed notifications to affected individuals on September 3, 2025, offering credit monitoring services.

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Incident timeline

discovery → filing · 5 weeks / 33 days

Aug 1, 2025

Discovered

Sep 3, 2025

Filed

vs. sector median

6 wks faster

This filing is one of 6 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

Nebraska State AGbd_6bc35c732ef888702025-09-03Verified
Massachusetts State AGbd_b1dcab681be67d6c2025-09-03Verified
Maine State AGbd_cfa541e53d8df43b2025-09-03Verified
HHS OCRbd_e5d5993ff23399652025-09-03Verified

Show 1 more filing ↓

Vermont State AGbd_ed7f8df2b704d1b62025-09-03Candidate

Name: Kevin M. Mekler, Esq.
norm: kevin m mekler esq

Name: Teamsters Union 25 Health Services & Insurance Plan
norm: teamsters union 25 health services insurance plan
Industry: HealthcarellmFinancial Servicesllm

Discovered: Aug 1, 2025
Materiality determined: —
Notification sent: Sep 3, 2025
Affected individuals: 1,521state-resident count only
Data types: Identity (basic)Government ID
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 Consumer Protection & Antitrust Bureau

During the incident: Took immediate steps to isolate and secure its network
Engaged third-party specialists to assist with containing and investigating the activity
Began reviewing the data to determine the contents of the data and to whom it related
Provided written notification to the potentially impacted New Hampshire residents... via First Class Mail
Notified the credit reporting agencies
Changes made: Providing you with access to Single Bureau Credit Monitoring/Single Bureau Credit Report/Single Bureau Credit Score services at no charge
Providing you with proactive fraud assistance
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(33 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 5 states

View merged incident ↗

Nebraska State AGSep 3 · first

Massachusetts State AGSep 3 · first

Maine State AGSep 3 · first

HHS OCRSep 3 · first

Vermont State AGSep 3 · first

New Hampshire State AGSep 3 · first · this page

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/teamsters-union-25-health-insurance-plan-20250903.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 3, 2025
Raw hash: 636ae6618ddd99b43a3b73902f9580b75144da47e04429995590867d1692ccf6

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityKevin M. Mekler, Esq.

Victim entityTeamsters Union 25 Health Services & Insurance Plan

Incidentdiscovered Aug 1, 2025

Stated responseTook immediate steps to isolate and secure its network

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov