HackingProfessional ServicesProfessional ServicesStolen CredentialsCustomer Data InvolvedGovernment IDIdentity (basic)MediumContained

Mark Leyden & Associates, LLC

bd_9e8ceb361a3a9e89 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Feb 18, 2026

Filed

Mar 24, 2026

To disclose

5 weeks

Affected

2state residents only

Linked

4 filings

Confidence

64%

Full breach record for Mark Leyden & Associates, LLC →

Mark Leyden & Associates, LLC notified the New Hampshire Attorney General of a cybersecurity event involving unauthorized access to an email account between May and October 2025. The breach affected two New Hampshire residents, exposing names, Social Security numbers, and/or driver's license numbers. Notification was sent on March 24, 2026, offering one year of credit monitoring.

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Incident timeline

undetected · 293 days

discovery → filing · 5 weeks / 34 days

May 1, 2025

Begins

Feb 18, 2026

Discovered

Mar 24, 2026

Filed

vs. sector median

14 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_0014e06b1dea16f82026-03-24Candidate
Massachusetts State AGbd_0ff7fe84cf3c680b2026-03-24Verified
Maine State AGbd_f82fa2a5c8b2bf092026-03-24Verified by operator

Name: Mark Leyden & Associates, LLC
norm: mark leyden associates

Name: Mark Leyden & Associates, LLC
norm: mark leyden associates
Industry: Professional Servicesllm

Discovered: Feb 18, 2026
Breach occurred: May 1, 2025 – Oct 31, 2025
Undetected for: 293 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 24, 2026
Affected individuals: 2state-resident count only
Data types: Government IDIdentity (basic)
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified New Hampshire Office of the Attorney General
Initial access: valid_credentials

During the incident: Sent notification letter via U.S. First-Class mail to New Hampshire residents
Offered a complimentary one-year subscription in credit monitoring and identity theft protection services through IDX
Established a dedicated, toll-free call center for individuals to call with questions
Changes made: Enhanced existing security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(34 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 · 4 states

View merged incident ↗

Indiana State AGMar 24 · first

Massachusetts State AGMar 24 · first

Maine State AGMar 24 · first

New Hampshire State AGMar 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/mark-leyden-associates-20260324.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 24, 2026
Raw hash: 6de63f6fd526e37cce0f025166e78d3f95bd4ba1d8f404a47a7acec6b422b7e9

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityMark Leyden & Associates, LLC

Victim entityMark Leyden & Associates, LLC

Incidentdiscovered Feb 18, 2026

Stated responseSent notification letter via U.S. First-Class mail to New Hampshire residents

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov