HackingRetail & ConsumerRetailStolen CredentialsCustomer Data InvolvedIdentity (basic)Government IDMediumContained

MGM RESORTS INTERNATIONAL

bd_65dbfae801fc66ab · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Oct 5, 2023

To disclose

—

Affected

Not disclosed

Linked

14 filings

Confidence

66%

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

MGM Resorts International notified Delaware and other state attorneys general of a cybersecurity incident involving unauthorized access to systems. The company shut down systems, engaged cybersecurity experts, and coordinated with law enforcement. Affected individuals were offered two years of complimentary credit monitoring and identity protection services through Experian. The incident involved personal information, including Social Security numbers.

J jump to incidentP pin to compareR raw source

Incident timeline — partial

? — ?

Breach window unknown

Oct 5, 2023

Filed

—

Corroborated · see linked filings

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

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
SEC 8-Kbd_6bbbeaea01c0cd312023-10-05Verified
Montana State AGbd_ee40948044b421ad2023-10-05Verified
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: Retail & Consumerllm

Discovered: —
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: Coordinating with law enforcement
Initial access: valid_credentials

During the incident: Shut 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 for two years at no cost
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 · 10 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

SEC 8-KOct 5 · first

Montana State AGOct 5 · first

Delaware 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://attorneygeneral.delaware.gov/wp-content/uploads/sites/50/2023/12/MGM-Resorts.pdf
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: 3c08628a9141d3573abe71f77aec1b055534504d528fd2d53442b1746ea1f323

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityMGM RESORTS INTERNATIONAL

Victim entityMGM RESORTS INTERNATIONAL

IncidentUnauthorized Access

Stated responseShut down certain systems

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceattorneygeneral.delaware.gov