---
title: "MGM Resorts security incident"
description: "What the retained public evidence establishes about the MGM Resorts incident, its attack path, impact, and response."
incident_type: "Cybersecurity incident"
status: "active"
last_modified: "2026-09-19"
canonical_url: "https://www.ally.security/incidents/mgm-resorts-security-incident-2023"
markdown_url: "https://www.ally.security/incidents/mgm-resorts-security-incident-2023.md"
stix_url: "https://www.ally.security/incidents/mgm-resorts-security-incident-2023/stix.json"
---

# MGM Resorts security incident

Scattered Spider; vished IT help desk after identifying an employee on LinkedIn. 10-day outage of slot machines, hotel key cards, reservations.

Last modified Sep 19, 2026 · 1 source

## Summary

- **Environment:** Hospitality/Casino
- **Operational impact:** 10-day outage of slot machines, hotel key cards, reservations
- **Financial impact:** approximately $100M

## What happened

In 2023, MGM Resorts experienced an incident in its hospitality/casino environment. The retained source describes the attack path as follows: Scattered Spider; vished IT help desk after identifying an employee on LinkedIn. [1](#source-1)

The documented consequence was: 10-day outage of slot machines, hotel key cards, reservations. [1](#source-1)

## Impact

- Documented impact: 10-day outage of slot machines, hotel key cards, reservations. [1](#source-1)
- Documented financial consequence: approximately $100M. [1](#source-1)

## Threat Group & Attack Vector

The retained source describes the attack path as follows: Scattered Spider; vished IT help desk after identifying an employee on LinkedIn. The canonical record does not add intrusion steps beyond those supported by the source. [1](#source-1)

### Actors

- **Scattered Spider** — identified in the supported attack description. [1](#source-1)

### TTPs

- No specific MITRE ATT\&CK technique is currently mapped for this case.

## Response

The retained source describes containment action intended to limit further access or disruption. [1](#source-1)

This account is bounded to [MGM Resorts International Form 8-K](https://www.sec.gov/Archives/edgar/data/789570/000119312523251667/d461062d8k.htm). Details absent from that evidence are left unresolved rather than inferred. [1](#source-1)

## Assets

[Download the case-scoped STIX 2.1 bundle](<https://www.ally.security/incidents/mgm-resorts-security-incident-2023/stix.json>)

## Sources

Primary source records used to research this incident.

<a id="source-1"></a>

### MGM Resorts International Form 8-K

regulatory · U.S. Securities and Exchange Commission

<https://www.sec.gov/Archives/edgar/data/789570/000119312523251667/d461062d8k.htm>

<details>
<summary>Evidence ledger</summary>

Review the supporting structured claims.

1. **Resulted In · 83% confidence · current**  
   MGM Resorts security incident: Scattered Spider; vished IT help desk after identifying an employee on LinkedIn.
2. **Resulted In · 100% confidence · current**  
   MGM Resorts security incident: The reviewed source documents the mgm resorts security incident involving MGM Resorts.
3. **Resulted In · 88% confidence · current**  
   MGM Resorts security incident: approximately $100M.
4. **Resulted In · 83% confidence · current**  
   MGM Resorts security incident: 10-day outage of slot machines, hotel key cards, reservations.
5. **Affected Organization · 100% confidence · current**  
   MGM Resorts security incident: MGM Resorts
6. **Resulted In · 90% confidence · current**  
   MGM Resorts security incident: The retained source describes containment action intended to limit further access or disruption.

</details>