HackingHospitalityHospitalityCustomer Data InvolvedGovernment IDIdentity (basic)MediumContained

The Thayer Hotel

bd_21fe280fdcbdc5b0 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 19, 2025

Filed

Nov 5, 2025

To disclose

7 weeks

Affected

174state residents only

Linked

11 filings

Confidence

66%

The Thayer Hotel (Hudson River Partners) experienced unauthorized access to its computer systems by an external actor on September 19, 2025. The incident affected 174 New Hampshire residents, exposing names, driver's license/state ID numbers, passport numbers, dates of birth, and potentially Social Security numbers. The organization restored system access, engaged third-party forensic specialists, notified law enforcement, and implemented enhanced security controls including network segmentation and endpoint security. Credit monitoring services were provided via Kroll Security.

J jump to incidentP pin to compareR raw source

Incident timeline

discovery → filing · 7 weeks / 47 days

Sep 19, 2025

Begins

Sep 19, 2025

Discovered

Nov 5, 2025

Filed

This filing is one of 11 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Texas State AGbd_d48218c6d02db3462025-11-04 · +1dVerified
California State AGbd_12aa427de683d4752025-11-03 · +2dVerified
Indiana State AGbd_5ff7442183fae9c42025-11-03 · +2dVerified
Maine State AGbd_7e2139f3f98129d02025-11-03 · +2dVerified

Show 6 more filings ↓up to 5d gap

Nebraska State AGbd_865aea85ac9a92842025-11-03 · +2dVerified
Massachusetts State AGbd_dedd83364d9f23632025-11-03 · +2dVerified
Nebraska State AGbd_ebafb05ebc7ff7242025-11-03 · +2dVerified
Vermont State AGbd_fed038a81b8b76ac2025-11-03 · +2dVerified
Illinois State AGbd_9f4989b24d7d4ab92025-11-01 · +4dVerified
Montana State AGbd_8009cd56be9477b82025-10-31 · +5dCandidate

Name: Hudson River Partners I L.P.
norm: hudson river partners i
Domain: thethayerhotel.com

Name: The Thayer Hotel
norm: thayer hotel
Domain: thethayerhotel.com
Industry: Hospitalityllm

Discovered: Sep 19, 2025
Breach occurred: Sep 19, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 31, 2025
Affected individuals: 174state-resident count only
Data types: Government IDIdentity (basic)
Data elements: Social Security numberDate of birth
Attack vector: Unauthorized Access
Threat actor: External
Regulator citations: Notified New Hampshire Attorney General

During the incident: Restored access to systems
Secured systems against similar events
Notified law enforcement
Launched investigation with assistance of third-party forensic specialists and cybersecurity professionals
Secured the affected systems to contain the breach
Began a review and enhancement of its cybersecurity policies, systems, and procedures
Implementing new administrative controls
Enhancing network segmentation
Reinforcing endpoint security
Secured the services of Kroll Security to provide credit monitoring services
Changes made: Implementing new administrative controls
Enhancing network segmentation
Reinforcing endpoint security
Review and enhancement of cybersecurity policies, systems, and procedures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 7 weeks(47 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 10 states

View merged incident ↗

Montana State AGOct 31 · first

Illinois State AG+1d

California State AG+3d

Indiana State AG+3d

Maine State AG+3d

Nebraska State AG+3d

Massachusetts State AG+3d

Nebraska State AG+3d

Vermont State AG+3d

Texas State AG+4d

New Hampshire State AG+5d · this page

Pattern: first filing Oct 31 (MT), last Nov 5 (NH) — a 5-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/hudson-river-partners-thayer-hotel-20251105.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 5, 2025
Raw hash: 5350dedb42e752fb0d6c024d3652c54e7ff77aeaecbe472ffa0f5f9ade766b09

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityHudson River Partners I L.P.

Victim entityThe Thayer Hotel

Incidentdiscovered Sep 19, 2025

Stated responseRestored access to systems

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov