Pentagon breach exposes Social Security numbers and military records of millions

The US government is alerting millions of people that their personal information was stolen during a breach of the Pentagon’s personnel records at the Defense Manpower Data Center (DMDC).

The DMDC is a central US Department of Defense (DoD) organization that manages personnel records, ID credentials, and benefit entitlements for military and civilian staff, veterans, and their families. It maintains over 60 million records for US military and civilian staff and their family members to help determine benefits and entitlements, such as healthcare and retirement.

Reportedly, cybercriminals had access from October 2025 to July 2026. CNN reports that the Pentagon confirmed the breach affects 2.76 million living individuals, potentially including current and former defense personnel or their dependents, and 294,000 deceased individuals.

“A small number of unauthorized users accessed files on a server containing unencrypted PII.”

PII means personally identifiable information. The attackers gained access by exploiting a security vulnerability in an unspecified file-sharing system. The Pentagon says it has “no indication” of misuse. It hasn’t explained how it reached that conclusion or what it considers misuse, and it doesn’t rule out future misuse of the exposed information.

The exposed data is said to include Social Security numbers, names, dates of birth, sex, race, and service details. Some records also include contact information and occupational specialty.

Besides the risk that this data could help foreign intelligence services track US personnel, affected people face a lasting risk of identity theft. Birth dates cannot be changed, and Social Security numbers can only be changed in limited circumstances.

Breaches happen every day. Don’t be the last to know.