Days after the Signal leak, the Pentagon warned the app was the target of hackers
Days after the Signal leak, the Pentagon warned the app was the target of hackers toggle caption NPR 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 app, even for unclassified information. A Signal spokesman said the Pentagon memo is not about the messaging app's level of security, but rather that users of the service should be aware of what are known as "phishing attacks." The March 18, 2025, Pentagon memo adds, "Please note: third party messaging apps are permitted by policy for unclassified accountability/recall exercises but are NOT approved to process or store nonpublic unclassified information." The 2023 Defense Department memo prohibited use of mobile applications for even "controlled unclassified information," which is many degrees less important than information about ongoing military operations.
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