HackingProfessional ServicesProfessional ServicesCustomer Data InvolvedIdentity (basic)MediumContained

Mengel, Metzger, Barr & Co., LLP

bd_b8fa640dea001fc6 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 19, 2025

Filed

Jun 26, 2025

To disclose

5 weeks

Affected · nationwide

10,38029 in this filing

Linked

4 filings

Confidence

65%

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

Mengel, Metzger, Barr & Co., LLP, an accounting firm, disclosed a cyberattack on February 21, 2025, discovered on May 19, 2025. The incident impacted the PII (names) of 10,380 individuals, including 29 Maine residents. The firm engaged third-party experts, secured systems, and offered 12-24 months of credit monitoring via Experian.

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Maine clockDiscovered May 19, 2025 → Filed with AG Jun 26, 202538d ⏱ ME AG >30d5 weeks 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 · 87 days

discovery → filing · 5 weeks / 38 days

Feb 21, 2025

Begins

May 19, 2025

Discovered

Jun 26, 2025

Filed

vs. sector median

14 wks faster

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

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Indiana State AGbd_57b7a00d71b4193c2025-06-26Verified
New Hampshire State AGbd_a6330afa9f49b5402025-06-30 · +4dCandidate
New Hampshire State AGbd_b51da914afab0b172025-07-21 · +25dVerified

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: 10,380state + nationwide
Data types: Identity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Regulator citations: Filed notification with Maine Attorney General
Initial access: exploit_public_facing

During the incident: Took immediate steps to secure systems and investigate
Engaged third-party experts
Provided notice to affected individuals
Arranged for Experian to provide 12/24 months of complimentary credit monitoring and related services
Changes made: Implemented additional security enhancements
Continue to regularly assess and strengthen security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(38 days from discovery to filing)
Compliance flags: ME AG >30d · 38d
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.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: May 19, 2025
→ Filed with AG: Jun 26, 2025
38d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: May 19, 2025 → Filed with AG: Jun 26, 2025	38d	30 days (soft)	ME AG >30d

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 · this page

New Hampshire State AG+4d

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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/d6c73c83-7948-4d55-8c89-6c5ae8071a6f.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 26, 2025
Raw hash: be6301104a3f689fef1a7c2d704180f7e2a20c7f4064799bcfa0d4ea52dafafb

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 systems and investigate

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov