---
title: "Neiman Marcus security incident"
description: "What the retained public evidence establishes about the Neiman Marcus 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/neiman-marcus-security-incident-2024"
markdown_url: "https://www.ally.security/incidents/neiman-marcus-security-incident-2024.md"
stix_url: "https://www.ally.security/incidents/neiman-marcus-security-incident-2024/stix.json"
---

# Neiman Marcus security incident

Stolen credentials were used against a Snowflake customer account that did not enforce MFA. Customer data exposed (second breach for the retailer).

Last modified Sep 19, 2026 · 1 source

## Summary

- **Environment:** Retail
- **Operational impact:** Customer data exposed (second breach for the retailer)
- **Financial impact:** No financial figure is established by the reviewed source evidence

## What happened

In 2024, Neiman Marcus experienced an incident in its retail environment. The retained source describes the attack path as follows: Stolen credentials were used against a Snowflake customer account that did not enforce MFA. [1](#source-1)

The documented consequence was: Customer data exposed (second breach for the retailer). [1](#source-1)

## Impact

- Documented impact: Customer data exposed (second breach for the retailer). [1](#source-1)
- No financial loss, ransom amount, recovery cost, or regulatory penalty is established by the reviewed source evidence.

## Threat Group & Attack Vector

The retained source describes the attack path as follows: Stolen credentials were used against a Snowflake customer account that did not enforce MFA. The canonical record does not add intrusion steps beyond those supported by the source. [1](#source-1)

### Actors

- No threat actor group has been identified in the reviewed public evidence.

### TTPs

- [T1078 — Valid Accounts](https://attack.mitre.org/techniques/T1078/) — mapped from the cited behavior. [1](#source-1)

## Response

The reviewed source does not describe containment, notification, or restoration steps in enough detail to summarize them responsibly.

This account is bounded to [Snowflake data security breach litigation](https://www.mtd.uscourts.gov/node/628). 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/neiman-marcus-security-incident-2024/stix.json>)

## Sources

Primary source records used to research this incident.

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

### Snowflake data security breach litigation

legal · U.S. District Court for the District of Montana

<https://www.mtd.uscourts.gov/node/628>

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

Review the supporting structured claims.

1. **Resulted In · 86% confidence · current**  
   Neiman Marcus security incident: Customer data exposed (second breach for the retailer).
2. **Resulted In · 100% confidence · current**  
   Neiman Marcus security incident: The reviewed source documents the neiman marcus security incident involving Neiman Marcus.
3. **Affected Organization · 100% confidence · current**  
   Neiman Marcus security incident: Neiman Marcus
4. **Used Attack Technique · 90% confidence · current**  
   Neiman Marcus security incident: https://attack.mitre.org/techniques/T1078/
5. **Resulted In · 84% confidence · current**  
   Neiman Marcus security incident: Stolen credentials were used against a Snowflake customer account that did not enforce MFA.

</details>