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CybersecuritySecurity NewswireCybersecurity News

Pentagon Data Breach Exposes Military Personnel

By Security Staff
The Pentagon
Kevin Doyle via Unsplash
September 28, 2026

The Pentagon experienced a breach of its HR system, exposing sensitive information of current and past military personnel, including Social Security numbers. This breach has raised concerns about counterintelligence among experts of national security.

A vulnerable computer server belonging to the Defense Manpower Data Center (DMDC) was accessed by unauthorized users last October; however, it wasn't discovered and remediated until July. 

At this time, it is unclear how many individuals have been impacted. However, some reports suggest as many as 4 million personnel for the Department of Defense may be affected. 

KEYWORDS: data breach military military veteran Pentagon social security numbers

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