It turns out that the NSA warned employees about vulnerabilities in the messaging app 'Signal,' which government officials used to share military planning information
It has been revealed that the National Security Agency (NSA) has issued a warning to its employees about the use of Signal, a messaging app with a reputation for security.
NSA warned of vulnerabilities in Signal app a month before Houthi strike chat - CBS News
Days after the Signal leak, the Pentagon warned the app was the target of hackers : NPR
According to CBS News, the NSA sent an 'Operational Security Special Bulletin' to employees in February 2025 warning them about vulnerabilities when using Signal.
The 'unclassified but for official use only' document, obtained by CBS News from a senior intelligence official, is titled 'Signal Vulnerability' and warns that professional Russian hacking groups are using phishing to bypass Signal's end-to-end encryption and gain access to encrypted conversations.
NSA full | PDF
It was also emphasized that third-party messaging apps such as Signal and WhatsApp cannot be used to transmit sensitive information.
The NSA did not respond to CBS News' request for comment on the incident.
Meanwhile, Signal has criticized the wording on its X (formerly Twitter) account, stating, 'The claim that 'Signal is vulnerable' is false. Although the document uses the word 'vulnerability,' it has nothing to do with Signal's core technology, and is merely a warning against phishing scams targeting Signal users.'
Right now there are a lot of new eyes on Signal, and not all of them are familiar with secure messaging and its nuances. Which means there's misinfo flying around that might drive people away from Signal and private communications.
— Signal (@signalapp) March 25, 2025
One piece of misinfo we need to address is the…
Incidentally, there has been a problem with Signal in which a senior Trump administration official mistakenly invited the editor-in-chief of the monthly magazine The Atlantic to join a group chat and had a conversation about attacks on Yemen.
President Trump's aide accidentally leaks top-secret war plans, actual screenshots also released - GIGAZINE
The Washington Post interviewed more than two dozen people on the condition of anonymity and noted that the Trump administration's active use of Signal raises the issue of a lack of public transparency.
Why Signal seems to be used by nearly everyone in Trump's Washington - The Washington Post
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