Department of Homeland Security Data Breach History

This page tracks the Department of Homeland Security data breach history and cybersecurity incidents affecting Department of Homeland Security (United States). BreachHistory currently indexes 5 publicly disclosed or catalogued incidents spanning 2006 through 2026, with approximately 247 thousand 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 Department of Homeland Security 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, while 1 remain unverified claims pending independent verification.

Largest Department of Homeland Security Data Breaches

The largest indexed incidents include the 2017 — Department of Homeland Security: A data breach at the Department of Homeland… and the 2006 — Department of Homeland Security: A computer storage device that may have he…. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by Department of Homeland Security or a regulator. Below is the list of large data breaches:

• 2017 2017 — Department of Homeland Security: A data breach at the Department of Homeland… — about 246.2K records exposed · Catalogued incident
• 2006 2006 — Department of Homeland Security: A computer storage device that may have held the… — about 900 records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include email addresses, 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.

Department of Homeland Security Data Breach 2026

At the time of this update, BreachHistory catalogues 2 2026 incidents related to Department of Homeland Security. Most recent entry: 2026 DHS/ICE — Hacktivist breach, contract data (Department of Peace). 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 Department of Homeland Security 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 Department of Homeland Security 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.