Defense Manpower Data Center（DMDC）

Flaw in US Defense Manpower Data Center file-sharing system exposed unencrypted SSNs and military records of over 3 million people for almost a year

According to Military Times, a September 18 notification letter from the Defense Manpower Data Center (DMDC) says it found a vulnerability in a file-sharing system on July 16 and that unauthorized users accessed files with unencrypted personal data on a server between October 2025 and July 16, 2026 .