Walmart Data Breach History

This page tracks the Walmart data breach history and cybersecurity incidents affecting Walmart (United States). BreachHistory currently indexes 9 publicly disclosed or catalogued incidents spanning 2009 through 2023, with approximately 2.6 million records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.

The Walmart breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed.

Largest Walmart Data Breaches

The largest indexed incidents include the 2018 MBM (Limoges Jewelry) exposes 1.3M customers — S3 bucket, the 2015 — Walmart: Hacking, 1,300,000 records, and the 2016 — Walmart: As reported by Health and Human Services…, along with additional historical incidents involving exposed passwords, public databases, and large-scale data scraping. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by Walmart or a regulator. Below is the list of large data breaches:

• 2018 MBM (Limoges Jewelry) exposes 1.3M customers — S3 bucket — about 1.3M records exposed · Catalogued incident
• 2015 2015 — Walmart: Hacking, 1,300,000 records — about 1.3M records exposed · Catalogued incident
• 2016 2016 — Walmart: As reported by Health and Human Services… — about 4.8K records exposed · Catalogued incident
• 2018 2018 — Walmart: Location of breached information: Unauthorized… — about 741 records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include email addresses, passwords and login credentials, phone numbers, names, physical addresses, payment card and financial account data, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

Walmart Data Breach 2026

At the time of this update, no Walmart data breach has been catalogued for 2026. New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.

What To Do If You Were Affected

If you believe your account may have been involved in a Walmart data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.

This Walmart breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.