HackingProfessional ServicesProfessional ServicesSupply Chain (3P Vendor)Customer Data InvolvedIdentity (basic)Government IDMediumContained

Thompson & Horton LLP

bd_68dca34fb6031c4d · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 3, 2024

Filed

Oct 29, 2025

To disclose

18 months

Affected

4state residents only

Linked

8 filings

Confidence

66%

Full breach record for Thompson & Horton LLP →

Thompson & Horton, LLP notified the New Hampshire Attorney General of a data breach affecting 4 state residents. Unauthorized access to an MSP-hosted server occurred between April 13 and May 3, 2024, discovered on May 3, 2024. Compromised data included names and SSNs. Notices were sent on October 29, 2025, offering credit monitoring.

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Incident timeline

undetected · 20 days

discovery → filing · 18 months / 544 days

Apr 13, 2024

Begins

May 3, 2024

Discovered

Oct 29, 2025

Filed

vs. sector median

+60 wks slower

This filing is one of 8 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (7) · sorted by filing gap

Nebraska State AGbd_2920937e521821482025-10-29Verified
Montana State AGbd_62dd0345ed0ce4652025-10-29Candidate
Indiana State AGbd_b344e037d355f1a02025-10-29Verified
Vermont State AGbd_ca2da2865ef941c22025-10-29Verified

Show 3 more filings ↓up to 1d gap

Maine State AGbd_2460f839b22fc5042025-10-30 · +1dVerified
Massachusetts State AGbd_67012f31f4f0f1c02025-10-30 · +1dVerified
Texas State AGbd_71c2bdcabc3a48a72025-10-30 · +1dVerified

Name: Cipriani
norm: cipriani
Domain: cipriani.com

Name: Thompson & Horton LLP
norm: thompson horton
Industry: Professional Servicesllm

Discovered: May 3, 2024
Breach occurred: Apr 13, 2024 – May 3, 2024
Undetected for: 20 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 29, 2025
Affected individuals: 4state-resident count only
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain Compromise
Threat actor: External
Regulator citations: Notified New Hampshire Office of the Attorney General, Consumer Protection Bureau
Third party: via All Covered
Initial access: supply_chain

During the incident: Engaged third-party forensic specialists to investigate
Notified federal law enforcement
Reviewed policies and procedures
Sent written notice to impacted New Hampshire residents
Offered complimentary credit monitoring and identity theft protection services for twelve (12) months
Changes made: Reviewed policies and procedures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 18 months(544 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 8 states

View merged incident ↗

Nebraska State AGOct 29 · first

Montana State AGOct 29 · first

Indiana State AGOct 29 · first

Vermont State AGOct 29 · first

New Hampshire State AGOct 29 · first · this page

Maine State AG+1d

Massachusetts State AG+1d

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/thompson-horton-20251029.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 29, 2025
Raw hash: 2f04a543ea698272b3cd69f75d7a91d7899914495720baa2b24542d4b1870ea8

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entityCipriani

Victim entityThompson & Horton LLP

Incidentdiscovered May 3, 2024

Stated responseEngaged third-party forensic specialists to investigate

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov