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US Defense Department Sued Over Data Breach Exposing Military Personal Data

US Defense Department Sued Over Data Breach Exposing Military Personal Data

First seen 22 Oct 2026, 20:14 UTC • •
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ThreatCluster AI
ThreatCluster •October 22, 2026 at 21:13 UTC
  • •The lawsuit involves a data breach affecting 3 million military personnel.
  • •Sensitive information, including Social Security numbers, was exposed for months.
  • •The breach was linked to an unencrypted file-sharing system.

The US Department of Defense is facing a class action lawsuit due to a data breach that compromised sensitive personal information of approximately 3 million current and former military personnel. The breach allegedly occurred due to a vulnerability in an unencrypted file-sharing system managed by the Defense Manpower Data Center. The lawsuit, filed by two Marines, claims that the breach exposed data, including Social Security numbers and dates of birth, for several months. This incident highlights a significant failure in data protection measures for military-affiliated individuals. The plaintiffs are seeking damages exceeding $5 million for the affected servicemembers. The breach reportedly lasted for nearly nine months, raising concerns about the security of military data management systems.

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Timeline

2025-07-01
Data breach occurred
Unauthorized access to the Defense Manpower Data Center's file-sharing system exposed personal data for nearly nine months.
News.Bloomberglaw
2026-10-21
Lawsuit filed
Two Marines filed a class action lawsuit against the Defense Department in the US District Court for the District of Columbia.
News.Bloomberglaw
2026-10-22
News coverage of lawsuit
The lawsuit gained media attention as it highlights significant data security failures within the Department of Defense.
Securitymagazine

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Extracted Entities (5)

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Common questions

Who is affected by the breach?
Approximately 3 million current and former military personnel may have had their personal information exposed.
What kind of data was compromised?
The breach exposed sensitive information, including Social Security numbers and dates of birth.
What actions are being taken in response?
A class action lawsuit has been filed seeking damages for the affected individuals.