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Pentagon Data Breach of Military Personnel Raises National Security Concerns

A notification letter said the breach may affect about 4 million Defense Department personnel, and the agency offered one year of credit monitoring.

  • The Defense Manpower Data Center discovered a "security vulnerability" in a file-sharing system in July that allowed unauthorized users to access unencrypted personally identifiable information between October 2025 and July 16, 2026.
  • Approximately four million Defense Department personnel may be affected by the breach, which exposed Social Security numbers and the "occupational specialty" of service members.
  • The Defense Department is offering affected individuals one year of credit monitoring through IDX, while Gen. Paul Stanton, director of the Defense Information Systems Agency, is leading a "cyber hunt" to evaluate systems for additional vulnerabilities.
  • Justin Sherman, CEO of Global Cyber Strategies, warned adversaries could pair stolen information with commercial datasets to target personnel based on earnings, debts, marriages, and spending habits.
  • While the Pentagon currently "does not have any indications of misuse," the DMDC remains "the one, central access point" for military benefits and medical readiness information for personnel and veterans.
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18 Articles

KIFIKIFI
+10 Reposted by 10 other sources
Center

Pentagon data breach of military personnel raises national security concerns

By Sean Lyngaas, Davis Winkie, CNN (CNN) — A data breach at the Pentagon’s vast HR system has exposed Social Security numbers and other personal information of current and former military personnel, raising counterintelligence concerns among national security experts. “Unauthorized users” gained access to a vulnerable computer server belonging to the Defense Manpower Data Center

·Idaho Falls, United States
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Air Force TimesAir Force Times
+3 Reposted by 3 other sources
Center

Military personnel data exposed in breach, agency warns

Unauthorized users accessed files containing the personal information of U.S. military personnel, a new breach notification letter warns.

·United States
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Air Force Times broke the news in United States on Thursday, September 24, 2026.
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