HackingProfessional ServicesProfessional ServicesCustomer Data InvolvedData ExfiltratedIdentity (basic)Government IDFinancial accountHealth (basic)MediumContained

Mengel, Metzger, Barr & Co., LLP

bd_a6330afa9f49b540 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 19, 2025

Filed

Jun 30, 2025

To disclose

6 weeks

Affected

44state residents only

Linked

4 filings

Confidence

66%

Full breach record for Mengel, Metzger, Barr & Co., LLP →

Mengel, Metzger, Barr & Co., LLP reported a cyberattack on February 21, 2025, affecting 44 New Hampshire residents. The incident exposed PII including names, SSNs, driver's licenses, financial account info, and some medical data. The firm detected the incident on May 19, 2025, secured systems, engaged third-party experts, and provided 12 months of credit monitoring to affected individuals.

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Incident timeline

undetected · 87 days

discovery → filing · 6 weeks / 42 days

Feb 21, 2025

Begins

May 19, 2025

Discovered

Jun 30, 2025

Filed

vs. sector median

13 wks faster

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Indiana State AGbd_57b7a00d71b4193c2025-06-26 · +4dVerified
Maine State AGbd_b8fa640dea001fc62025-06-26 · +4dCandidate
New Hampshire State AGbd_b51da914afab0b172025-07-21 · +21dVerified

Name: Mengel, Metzger, Barr & Co., LLP
norm: mengel metzger barr

Name: Mengel, Metzger, Barr & Co., LLP
norm: mengel metzger barr
Industry: Professional Servicesllm

Discovered: May 19, 2025
Breach occurred: Feb 21, 2025
Undetected for: 87 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 26, 2025
Affected individuals: 44state-resident count only
Data types: Identity (basic)Government IDFinancial accountHealth (basic)
Data elements: Social Security numberDate of birthMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: ExternalFinancial
Regulator citations: Notified New Hampshire Office of the Attorney General
Initial access: exploit_public_facing

During the incident: Took immediate steps to secure its systems and investigate the nature and scope of the Incident
Provided notice to the affected New Hampshire residents
Arranged for the individuals to enroll in free credit monitoring and related services for 12 months
Changes made: Strengthened its existing endpoint detection and response software
Bolstered its data ingress and egress system
Increased the frequency and complexity of cyber security training for its employees
Thoroughly reviewed and updated its existing data security policies and procedures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(42 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 3 states

View merged incident ↗

Indiana State AGJun 26 · first

Maine State AGJun 26 · first

New Hampshire State AG+4d · this page

New Hampshire State AG+25d

Pattern: first filing Jun 26 (IN), last Jul 21 (NH) — a 25-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/mengel-metzger-barr-20250630.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 30, 2025
Raw hash: 56dd2b664e4466ed7f864cf403076166ff5454372fa3bc2d98ebfda6133d99ea

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityMengel, Metzger, Barr & Co., LLP

Victim entityMengel, Metzger, Barr & Co., LLP

Incidentdiscovered May 19, 2025

Stated responseTook immediate steps to secure its systems and investigate the nature and scope of the Incident

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov