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Hacker Breaches TeleMessage, Exposing Security Flaws in U.S. Government Messaging

A vulnerability in the Signal-like app used for archiving government communications allowed access to sensitive data, sparking concerns over encryption and compliance practices.

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U.S. National Security Advisor Mike Waltz walks to board Marine One at the White House in Washington, D.C., U.S., April 3, 2025. REUTERS/Carlos Barria/File Photo
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Overview

  • TeleMessage, a modified Signal app used by U.S. government officials, was hacked, exposing archived communications and backend credentials.
  • The hacker accessed data from users including U.S. Customs and Border Protection, Coinbase, and Scotiabank, but messages from top cabinet officials were not compromised.
  • The breach exploited the lack of end-to-end encryption in TeleMessage's archiving process, a critical security vulnerability.
  • TeleMessage, owned by Smarsh and rebranding as Capture Mobile, provides archive-enabled versions of encrypted messaging apps for compliance purposes.
  • The incident has reignited scrutiny over the use of unofficial messaging platforms in government and the risks of balancing record-keeping with operational security.