The National Security Agency sent out an operational security special bulletin to its employees in February 2025 warning them of vulnerabilities in using the encrypted messaging application Signal, according to internal NSA documents obtained by CBS News. The NSA is an arm of the Defense Department and specializes in signals intelligence — which is derived from electronic transmissions — and cybersecurity. The agency is responsible for monitoring, collecting and processing information and data for U.S. national security interests. "A vulnerability has been identified in the Signal Messenger Application. The use of Signal by common targets of surveillance and espionage activity has made the application a high value target to intercept sensitive information," the internal bulletin begins.
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