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Iranian-Affiliated Cyber Actors Exploit Programmable Logic Controllers Across US Critical Infrastructure

April 6, 2026 · CISA Cybersecurity Advisories · Severity: CRITICAL

CISA issued an advisory on Iranian-affiliated cyber actors exploiting programmable logic controllers across US critical infrastructure. The attackers target OT environments using known vulnerabilities and weak authentication. Sectors including water and energy are urged to harden their industrial control systems.

Key Takeaways

  • Iranian-affiliated cyber actors are exploiting programmable logic controllers across US critical infrastructure sectors.
  • The advisory details how threat actors target OT environments using known PLC vulnerabilities and default credentials.
  • Water and energy sector organizations should inventory PLC assets and enforce strong authentication and network segmentation.
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