HackingOtherVulnerability ExploitData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

New Hampshire Historical Society

bd_f876bba9e20e576f · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 9, 2026

Filed

Apr 1, 2026

To disclose

23 days

Affected

3state residents only

Linked

5 filings

Confidence

66%

Full breach record for New Hampshire Historical Society →

The New Hampshire Historical Society experienced an external system breach (hacking) on February 13, 2026, discovered on March 9, 2026. The incident affected 3 Maine residents, involving the exfiltration of names and government identifiers. The Society engaged forensic investigators, notified law enforcement, and provided 12 months of credit monitoring. Remediation included MFA implementation and security assessments.

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Maine clockDiscovered Mar 9, 2026 → Filed with AG Apr 1, 202623d ✓ ME AG ≤30d23 days 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 · 24 days

discovery → filing · 23 days

Feb 13, 2026

Begins

Mar 9, 2026

Discovered

Apr 1, 2026

Filed

vs. sector median

5 wks faster

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Vermont State AGbd_454407f5e00ef36c2026-04-01Candidate
New Hampshire State AGbd_6a2e16e40b883f092026-04-01Verified
Massachusetts State AGbd_9b87ba887e50caab2026-04-01Verified
Indiana State AGbd_a1b8c9ff8dea473f2026-04-01Verified

Name: New Hampshire Historical Society
norm: new hampshire historical society
Domain: nhhs.org

Name: New Hampshire Historical Society
norm: new hampshire historical society
Domain: nhhs.org
Industry: Otherllm

Discovered: Mar 9, 2026
Breach occurred: Feb 13, 2026
Undetected for: 24 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 1, 2026
Affected individuals: 3state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Regulator citations: Notified Maine Attorney General
Initial access: exploit_public_facing

During the incident: Engaged third-party forensic investigators
Notified law enforcement (FBI, Secret Service, etc.)
Retained outside legal counsel
Sent notification letters to affected individuals
Provided credit monitoring / identity protection services
Changes made: Implemented multi-factor authentication (MFA)
Enhanced security awareness training
Deployed additional security controls
Patched affected systems / applied security updates
Reviewed and strengthened access controls
Enhanced encryption of sensitive data
Improved backup and recovery procedures
Conducted comprehensive security assessment
Updated incident response procedures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 23 days(23 days from discovery to filing)
Compliance flags: ME AG ≤30d · 23d
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: Mar 9, 2026
→ Filed with AG: Apr 1, 2026
23d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Mar 9, 2026 → Filed with AG: Apr 1, 2026	23d	30 days	ME AG ≤30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Vermont State AGApr 1 · first

New Hampshire State AGApr 1 · first

Massachusetts State AGApr 1 · first

Indiana State AGApr 1 · first

Maine State AGApr 1 · 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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/d74f91eb-99bb-4c57-977c-969ce2987eeb.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 1, 2026
Raw hash: b4e2959cc8c99159dea5fbb5740f68c23788bc36bd0da0c7983e7dc6b62c8759

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityNew Hampshire Historical Society

Victim entityNew Hampshire Historical Society

Incidentdiscovered Mar 9, 2026

Stated responseEngaged third-party forensic investigators

ComplianceME AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov