Several days after top national security officials accidentally included a reporter in a Signal chat about bombing Houthi sites in Yemen, a Pentagon-wide advisory warned against using the messaging ...

WASHINGTON – Defense Secretary Pete Hegseth divulged classified information in March from battlefield commanders about the U.S. attack on Houthi rebels in a chat on the commercial messaging app Signal ...

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, ...

The company behind the Signal clone used by at least one Trump administration official was breached earlier this month. The hacker says they got in thanks to a basic misconfiguration. Only he wasn’t ...

An extraordinary breach of U.S. security is stunning security and intelligence veterans, after a journalist was added to a Trump administration group chat on Signal, where senior leaders discussed ...