CISA, together with the Departments of War, Energy, State, and the FBI, issued a joint guide titled ‘Adapting Zero Trust Principles to Operational Technology’ on April 29 2026. The guide aims to help owners and operators of operational technology (OT) systems—including government networks—apply Zero Trust principles while addressing unique constraints such as legacy infrastructure, safety requirements, and operational continuity. It highlights key focus areas, including establishing network zones and conduits, mitigating supply‑chain risks, and strengthening identity and access management. Officials noted that increasingly interconnected OT systems expose new attack vectors and that a Zero Trust approach can prevent adversaries from compromising critical physical processes. The guide is intended to support stakeholders at all cybersecurity maturity levels and is available on CISA.gov.
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