HackingHospitalityHospitalityCustomer Data InvolvedIdentity (basic)Government IDMediumContained

The Historic Thayer Hotel

bd_12aa427de683d475 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 19, 2025

Filed

Nov 3, 2025

To disclose

6 weeks

Affected

Not disclosed

Linked

11 filings

Confidence

65%

The Historic Thayer Hotel experienced unauthorized access to its computer systems on September 19, 2025. The incident exposed names combined with driver's license numbers, passport numbers, dates of birth, state ID numbers, and potentially Social Security numbers for US residents. The hotel engaged third-party forensic specialists, notified law enforcement, and is providing 12 months of credit monitoring via Kroll Security. No identity theft or fraud has been observed to date.

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California clockDiscovered Sep 19, 2025 → Notified Oct 31, 202542d ✓ CA 60-day OK6 weeks discovery → filing

Incident timeline

discovery → filing · 6 weeks / 45 days

Sep 19, 2025

Begins

Sep 19, 2025

Discovered

Nov 3, 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

Indiana State AGbd_5ff7442183fae9c42025-11-03Verified
Maine State AGbd_7e2139f3f98129d02025-11-03Verified
Nebraska State AGbd_865aea85ac9a92842025-11-03Verified
Massachusetts State AGbd_dedd83364d9f23632025-11-03Verified

Show 6 more filings ↓up to 3d gap

Nebraska State AGbd_ebafb05ebc7ff7242025-11-03Verified
Vermont State AGbd_fed038a81b8b76ac2025-11-03Verified
Texas State AGbd_d48218c6d02db3462025-11-04 · +1dVerified
New Hampshire State AGbd_21fe280fdcbdc5b02025-11-05 · +2dVerified
Illinois State AGbd_9f4989b24d7d4ab92025-11-01 · +2dVerified
Montana State AGbd_8009cd56be9477b82025-10-31 · +3dCandidate

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

Name: The Historic Thayer Hotel
norm: the historic 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: Not disclosed
Data types: Identity (basic)Government ID
Data elements: Social Security numberDate of birth
Attack vector: Unknown
Threat actor: External
Regulator citations: Notifying appropriate regulators and others as required by governing law

During the incident: Recover from the event, including restoring our own access to our systems
Secure our systems against similar events
Notify law enforcement
Launched an investigation with the assistance of third-party forensic specialists and cybersecurity professionals
Notifying affected individuals
Notifying appropriate regulators and others as required by governing law
Secured the services of Kroll Security to provide credit monitoring services where appropriate at no cost to affected individuals for twelve (12) months
Changes made: Implementing additional safety measures to prevent a recurrence of such an incident
Continually evaluate and modify our practices and internal controls to enhance the security and privacy of personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(45 days from discovery to filing)
Compliance flags: CA 60-day OK · 42d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Sep 19, 2025
→ Notified: Oct 31, 2025
42d 60 days (analyst band, pre-2026 discoveries) CA 60-day OK

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Sep 19, 2025 → Notified: Oct 31, 2025	42d	60 days (analyst band, pre-2026 discoveries)	CA 60-day OK

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 10 states

View merged incident ↗

Montana State AGOct 31 · first

Massachusetts State AG+3d

Nebraska State AG+3d

Vermont State AG+3d

California State AG+3d · this page

Texas State AG+4d

New Hampshire State AG+5d

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://oag.ca.gov/ecrime/databreach/reports/sb24-613747
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 3, 2025
Raw hash: 381bdb96d0846ba5aac68fb5b74867e6ec31eb091865396a7083ddfa272f3833

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityHudson River Partners I L.P.

Victim entityThe Historic Thayer Hotel

Incidentdiscovered Sep 19, 2025

Stated responseRecover from the event, including restoring our own access to our systems

ComplianceCA 60-day OK

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov