US Agencies Confirm Iranian Hackers Altered Safety Logic in Critical Infrastructure Breach

A July 22, 2026 joint advisory from FBI, NSA, DOE, CISA, and EPA confirms Iranian state-backed hackers breached at least one US critical infrastructure provider and reprogrammed PLC logic to disable safety shutdowns and alarms. The advisory states the activity was "specifically to cause disruptive effects within the United States" — a marked escalation from prior awareness-level warnings.