HackingHospitalityHospitalityCustomer Data InvolvedData ExfiltratedIdentity (basic)Government IDMediumContained

MGM RESORTS INTERNATIONAL

bd_f7c35a0d4803f35c · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Oct 5, 2023

To disclose

—

Affected

Not disclosed

Linked

14 filings

Confidence

65%

Full breach record for MGM RESORTS INTERNATIONAL →4 incidents on file

MGM Resorts International disclosed that an unauthorized third party obtained personal information of some customers on September 11, 2023. The breach window was identified as September 8-12, 2023. Affected data included names, contact information, gender, date of birth, Social Security numbers, and driver's license numbers. For a limited number of customers, passport numbers were also affected. Passwords, bank account numbers, and payment card information were not believed to be affected. MGM shut down certain systems, engaged cybersecurity experts, coordinated with law enforcement, and offered credit monitoring.

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Incident timeline

Sep 8, 2023

Begins

Oct 5, 2023

Filed

This filing is one of 14 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Washington State AGbd_05c59c84e811817f2023-10-05Verified by operator
Oregon State AGbd_25f570b90148b65e2023-10-05Verified by operator
Vermont State AGbd_2cf9544a4111fecb2023-10-05Verified
Massachusetts State AGbd_3d31054a0da622772023-10-05Verified by operator

Show 6 more filings ↓up to 61d gap

Indiana State AGbd_4bd1f6acdf646a9e2023-10-05Verified
Maine State AGbd_4e28f4a3e508d5422023-10-05Verified
Delaware State AGbd_65dbfae801fc66ab2023-10-05Verified by operator
SEC 8-Kbd_6bbbeaea01c0cd312023-10-05Verified
South Carolina State AGbd_a165e7cc6b9dc2252023-10-06 · +1dVerified
California State AGbd_0171facdc96060a92023-12-05 · +61dVerified

Showing first 10 of 13 linked disclosures.

Name: MGM RESORTS INTERNATIONAL
norm: mgm resorts
Domain: mgmresorts.com

Name: MGM RESORTS INTERNATIONAL
norm: mgm resorts
Domain: mgmresorts.com
Industry: Hospitalityllm

Discovered: —
Breach occurred: Sep 8, 2023 – Sep 12, 2023
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Data elements: Social Security numberDate of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External

During the incident: Shutting down certain systems
Launched an investigation with the assistance of leading cybersecurity experts
Coordinating with law enforcement
Put in place additional safeguards to further protect our systems
Arranged with Experian to offer credit monitoring and identity protection services
Changes made: Put in place additional safeguards to further protect our systems
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 9 states

View merged incident ↗

Washington State AGOct 5 · first

Oregon State AGOct 5 · first

Vermont State AGOct 5 · first

Massachusetts State AGOct 5 · first

Indiana State AGOct 5 · first

Maine State AGOct 5 · first

Delaware State AGOct 5 · first

SEC 8-KOct 5 · first

California State AGOct 5 · first · this page

South Carolina State AG+1d

California State AG+61d

Pattern: first filing Oct 5 (WA), last Dec 5 (CA) — a 61-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 13 — the full spread may be wider.

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/sb24-574721
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 5, 2023
Raw hash: 12a8143c515118f37ee53f60f47b5f7ca2e1b1ed792ec677e45d29d7c758b5db

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityMGM RESORTS INTERNATIONAL

Victim entityMGM RESORTS INTERNATIONAL

IncidentUnauthorized Access

Stated responseShutting down certain systems

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov