Critical infrastructure (CI) organizations underpin national security, public safety, and the economy. In 2026, the cyber threat landscape facing these sectors is structurally different than it was even two years ago. What Microsoft Threat Intelligence is observing across critical infrastructure environments right now is not a forecast. It is already happening. Threat actors are no longer focused solely on data theft or opportunistic disruption. They are establishing persistent access, footholds they can sit in quietly, undetected, and activate at the moment of maximum disruption. That is the threat CI leaders need to be preparing for today. Not someday. Now.

Given these rising threats, governments worldwide are advancing policies and regulations to require critical infrastructure organizations to prioritize continuous readiness and proactive defense. The regulatory trajectory is clear. The U.S. National Cybersecurity Strategy published in March 2023 explicitly frames cybersecurity of critical infrastructure as a national security imperative. Japan issued a basic policy to implement the Active Cyber Defense legislation in 2025. Europe continues to implement the NIS2 Directive across the essential sectors. And Canada is advancing a more prescriptive approach to critical infrastructure security through Bill C8.

What Microsoft Threat Intelligence hears from law enforcement agencies reinforces what we observe in our own telemetry. For example, Operation Winter SHIELD is a joint initiative led by the FBI Cyber Division focused on helping CI organizations move from awareness to verified readiness. Implementation not just awareness, not just policy. It is what closes the gap between knowing you are a target and being ready when it matters.

  The water sector offers a clear illustration of what that implementation gap looks like in practice and what it takes to close it. The findings from Microsoft, released on March 19, 2026, in collaboration with the Cyber Readiness Institute and the Center on Cyber Technology and Innovation show that hands-on coaching paired with practical training materially improves cyber readiness in water and wastewater utilities in ways that guidance alone does not. When attacks succeed, communities face safety concerns, loss of trust, and service disruptions. That is not an abstraction. That is what is at stake across every CI sector.

To say that environments CI organizations are defending today were not designed for the threat they are facing is an understatement. Legacy systems now operate within hybrid IT–OT environments connected by cloud-based identity, remote access, and complex vendor ecosystems that did not exist when those systems were built. Identity has become the central control layer across all of it. Microsoft Threat Intelligence and Incident Response investigations show a convergence of identity-driven intrusion, living-off-the-land (LOTL) persistence, and nation-state prepositioning across CI. Against this backdrop, five facts define the resilience priorities CI leaders must address in 2026.