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FBI Warns of Russian Hackers Targeting Signal Users

3/21/2026

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Summary

Story summary

The Federal Bureau of Investigation (FBI) and Cybersecurity and Infrastructure Security Agency (CISA) issued a joint warning that Russian intelligence–linked hackers target Signal users.
They compromised thousands of accounts, focusing on high-value individuals including U.S. officials and journalists.
The attackers bypass security by impersonating trusted sources to obtain security codes, while encryption remains intact.
Signal confirmed its infrastructure is not compromised.
Users are urged to report suspicious activity to the FBI.

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Story summary

The Federal Bureau of Investigation (FBI) and Cybersecurity and Infrastructure Security Agency (CISA) issued a joint warning that Russian intelligence–linked hackers target Signal users.
They compromised thousands of accounts, focusing on high-value individuals including U.S. officials and journalists.
The attackers bypass security by impersonating trusted sources to obtain security codes, while encryption remains intact.
Signal confirmed its infrastructure is not compromised.
Users are urged to report suspicious activity to the FBI.