FBI warns Russian hackers targeting Americans on Signal; thousands of accounts compromised

Russian intelligence-linked hackers are targeting users of popular messaging apps like Signal, gaining access to private messages and impersonating victims in a sweeping global campaign, according to a joint warning from the FBI and U.S. cybersecurity officials.

The FBI and the Cybersecurity and Infrastructure Security Agency said the operation has already compromised "thousands of individual" commercial messaging app (CMA) accounts, allowing attackers to read messages, access contact lists and send messages posing as the victim.