HackingProfessional ServicesProfessional ServicesData ExfiltratedCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDHealth (basic)MediumContained

Transport Workers Union Local 100

bd_c859070a609e7efb · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 15, 2026

Filed

Apr 24, 2026

To disclose

9 days

Affected

5state residents only

Linked

7 filings

Confidence

66%

Transport Workers Union Local 100 notified the New Hampshire Attorney General of a data breach occurring between January 29 and February 3, 2026. An unauthorized third party accessed and exfiltrated files containing personal information (name, address, DOB, SSN, health insurance ID) of 5 New Hampshire residents. The breach was discovered on April 15, 2026. The union retained forensic experts, notified law enforcement, and is providing 24 months of identity monitoring to affected individuals.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >30d9 days 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 · 76 days

discovery → filing · 9 days

Jan 29, 2026

Begins

Apr 15, 2026

Discovered

Apr 24, 2026

Filed

vs. sector median

16 wks faster

This filing is one of 7 about the same incident.View merged incident

A leak claim by qilin about this victim predates this filing by 80 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (2)

Leak Siteqilinbd_cffcb48ce7af01f32026-02-23 · +59dVerified by operator
Leak Siteqilinbd_4cde0d138cbb2a222026-02-03 · +80dVerified by operator

Regulatory filings (4) · sorted by filing gap

Indiana State AGbd_02a456927aea01292026-04-24Verified by operator
Indiana State AGbd_36f2deae02d39a282026-04-24Verified
Vermont State AGbd_972f7a479631d7552026-04-24Verified
Massachusetts State AGbd_b1c4e7ab687bca142026-04-24Verified by operator

Name: Transport Workers Union Local 100
norm: transport workers union local 100
Domain: twulocal100.org

Name: Transport Workers Union Local 100
norm: transport workers union local 100
Domain: twulocal100.org
Industry: Professional Servicesllm

Discovered: Apr 15, 2026
Breach occurred: Jan 29, 2026 – Feb 3, 2026
Undetected for: 76 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 24, 2026
Affected individuals: 5state-resident count only
Data types: Identity (basic)Government IDHealth (basic)
Data elements: Social Security numberDate of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Notified New Hampshire Department of Justice / Office of the Attorney General
Initial access: exploit_public_facing

During the incident: Retained leading third-party experts to conduct a review of the incident
Notified appropriate law enforcement
Implemented additional security measures
Undertook a review, working with third-party experts, to determine the nature and scope of the unauthorized access and confirm it was contained
Notified affected individuals by mail
Provided 24 months of identity monitoring services from IDX
Changes made: Implemented additional security measures to help further protect against this type of incident going forward
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 days(9 days from discovery to filing)
Compliance flags: Leak >30d
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 · 5 filings · 4 states

View merged incident ↗

Indiana State AGApr 24 · first

Vermont State AGApr 24 · first

Massachusetts State AGApr 24 · first

New Hampshire State AGApr 24 · 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/transport-workers-union-local-100-20260424.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 24, 2026
Raw hash: 9755286a83bf7f6e1366078c4bbe571746a6742647bcf7c877762d505255779c

Linked disclosures

Ransomware claims (2)

Regulatory filings (4) · sorted by filing gap

Reporting entityTransport Workers Union Local 100

Victim entityTransport Workers Union Local 100

Incidentdiscovered Apr 15, 2026

Stated responseRetained leading third-party experts to conduct a review of the incident

ComplianceLeak >30d

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov