HackingProfessional ServicesProfessional ServicesCustomer Data InvolvedDelayed DiscoveryPIIIdentity (basic)Government IDMediumContained

Tarter Krinsky & Drogin LLP

bd_718a78f94dfa7fc2 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Sep 10, 2025

Filed

Sep 15, 2026

To disclose

12 months

Affected

83state residents only

Linked

9 filings

Confidence

68%

Full breach record for Tarter Krinsky & Drogin LLP →

Tarter Krinsky & Drogin LLP (TKD), through its counsel Mullen Coughlin LLC, filed this supplement to its June 2026 notice to the New Hampshire Attorney General. The letter states that TKD became aware of suspicious activity in its environment on September 10, 2025, and that an investigation found unauthorized access to certain TKD servers at various times between July 9, 2025 and September 9, 2025. It states that between September 14 and September 15, 2026, TKD provided written notice to eighty-three (83) additional New Hampshire residents, and that the information identified varied by individual but collectively includes name and Social Security number. TKD notified federal law enforcement and is offering one year of credit monitoring through TransUnion.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 63 days

discovery → filing · 12 months / 370 days

Jul 9, 2025

Begins

Sep 10, 2025

Discovered

Sep 15, 2026

Filed

vs. sector median

+33 wks slower

This filing is one of 9 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (8) · sorted by filing gap

California State AGbd_0f270b92e68782272026-09-15Verified
HHS OCRbd_42a43f03c9a492852026-09-15Verified
Texas State AGbd_cea9ee41460cd42d2026-06-09 · +98dVerified
New Hampshire State AGbd_15f21ff79b0112172026-06-05 · +102dVerified

Show 4 more filings ↓up to 102d gap

Indiana State AGbd_18d9db7ac1e2d5f02026-06-05 · +102dVerified
Maine State AGbd_84538679dc6bce762026-06-05 · +102dVerified
Vermont State AGbd_89096b1050df0c002026-06-05 · +102dVerified
Massachusetts State AGbd_94f22eccb22dcf5d2026-06-05 · +102dCandidate

Name: Mullen Coughlin LLC
norm: mullen coughlin

Name: Tarter Krinsky & Drogin LLP
norm: tarter krinsky drogin
Domain: tarterkrinsky.com
Industry: Professional Servicesllm

Discovered: Sep 10, 2025
Breach occurred: Jul 9, 2025 – Sep 9, 2025
Undetected for: 63 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 4, 2026
Affected individuals: 83state-resident count only
Data types: PIIIdentity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Providing written notice of this incident to relevant state and federal regulators, as necessary

During the incident: Launched an investigation into the nature and scope of the activity with the assistance of third-party forensic specialists
Undertook a comprehensive review of the affected files with the assistance of third-party subject matter specialists
Notified federal law enforcement regarding the event
Providing access to credit monitoring services for one (1) year, through TransUnion, to individuals whose personal information was potentially affected by this incident, at no cost to these individuals
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
Changes made: Implemented additional cybersecurity measures to further protect against similar events moving forward
Reviewing existing security policies
Implementing additional safeguards and training to its employees
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 12 months(370 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 9 filings · 8 states

View merged incident ↗

New Hampshire State AGJun 5 · first

Indiana State AGJun 5 · first

Maine State AGJun 5 · first

Vermont State AGJun 5 · first

Massachusetts State AGJun 5 · first

Texas State AG+4d

California State AG+102d

HHS OCR+102d

New Hampshire State AG+102d · this page

Pattern: first filing Jun 5 (NH), last Sep 15 (NH) — a 102-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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/tarter-krinsky-drogin-20260915.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 15, 2026
Raw hash: d91ea11eb84aef26b85b21bdcd0273ae15f1612ee9b995713dc95a18fe4dcf54

Linked disclosures

Regulatory filings (8) · sorted by filing gap

Reporting entityMullen Coughlin LLC

Victim entityTarter Krinsky & Drogin LLP

Incidentdiscovered Sep 10, 2025

Stated responseLaunched an investigation into the nature and scope of the activity with the assistance of third-party forensic specialists

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov