FEDERALItem 7.01 · voluntary (Reg FD)HackingHospitalityHospitalityData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDCriticalContained

MGM RESORTS INTERNATIONAL

bd_6bbbeaea01c0cd31 · schema v1 · pii pii-v1

Severity

Critical

Financial impact

$100.00M

Discovered

Sep 12, 2023

Filed

Oct 5, 2023

To disclose

23 days

Affected

Not disclosed

Linked

14 filings

Confidence

66%

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

MGM Resorts International disclosed a cybersecurity incident detected on September 12, 2023. Criminal actors obtained personal information (names, contact info, DOB, driver's license numbers) and, for a limited number of customers, Social Security and passport numbers, for transactions prior to March 2019. The company shut down systems to contain the breach, preventing access to payment card data. Estimated negative impact on Q3 Adjusted Property EBITDAR is ~$100 million. Investigation is ongoing but activity is contained.

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Incident timeline

undetected · 1656 days

discovery → filing · 23 days

Mar 1, 2019

Begins

Sep 12, 2023

Discovered

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
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
SEC CIK: 0000789570
Domain: mgmresorts.com
Industry: Hospitality

Name: MGM RESORTS INTERNATIONAL
norm: mgm resorts
SEC CIK: 0000789570
Domain: mgmresorts.com
Industry: Hospitality
Industry: Hospitalityllm

Discovered: Sep 12, 2023
Breach occurred: Mar 1, 2019
Undetected for: 1,656 daysoccurrence → discovery
Materiality determined: Oct 5, 2023
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Unknown
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External

During the incident: Shut down its systems to mitigate risk to customer information
Engaged industry-leading third-party experts
Established a dedicated help line to address questions about this incident
Set up a webpage with additional information
Will provide notification by email to individuals impacted by this issue as required by law
Will offer those individuals free identity protection and credit monitoring services
Changes made: Taken significant measures, working with industry-leading third-party experts, to further enhance its system safeguards
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 23 days(23 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 ↗

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

Montana State AGOct 5 · first

SEC 8-KOct 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 filing

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statementThis record

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.sec.gov/Archives/edgar/data/789570/000119312523251667/
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Oct 5, 2023
Raw hash: 6ddff145b8675d7e36577703c689314f86082a39f0bf859599eda562c8fe4598

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Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityMGM RESORTS INTERNATIONAL

Victim entityMGM RESORTS INTERNATIONAL

Incidentdiscovered Sep 12, 2023

Stated responseShut down its systems to mitigate risk to customer information

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.sec.gov

Source filing