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Defense Manpower Data Center (DMDC) hit by network compromise

Incident
First reported
Last updated
Happening score
H score 18
1 unique sources, 1 articles

Summary

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The Defense Manpower Data Center (DMDC) disclosed a breach of the Pentagon human resources management system that exposed sensitive personnel data for more than 3 million people. The compromise involved unauthorized access through file-sharing systems and put PII and other military records at risk.

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Timeline

  1. 01.10.2026 12:44 2 articles · 12d ago

    Defense Manpower Data Center notifies military personnel of Pentagon data breach

    Initial Disclosure

    DMDC notified affected military personnel that hackers breached the Pentagon human resources management system in October 2025 and that a small number of unauthorized users accessed sensitive personnel data, including personally identifiable information, between October 2025 and July 2026 by exploiting a vulnerability in file-sharing systems. Pentagon officials said the breach affects more than 3 million people, and DMDC said it immediately initiated privacy and cybersecurity incident response actions and is offering 12 months of free credit monitoring through IDX.

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