Cyber Risk Assumptions Are Becoming Obsolete Due to AI, Warn Five Eyes

**Executive Summary:** The Five Eyes cyber agencies warn that rapid advances in AI, particularly Frontier AI, are accelerating the speed, scale, and sophistication of cyber threats and shortening the window between vulnerability disclosure and exploitation; they urge executives and boards to treat cyber resilience as a core business responsibility, adopt secure-by-design and layered defenses, accelerate patching, strengthen identity and access controls, test incident response, and integrate AI defensively to reduce technical, operational, financial, and reputational exposure.