Executive Order 14409, signed June 2, 2026, mandates federal agencies harden systems against AI-enabled threats within 30-60 days, establishing a federal vulnerability clearinghouse for AI weaknesses and an interagency coordination structure. Federal agencies, federal contractors, and critical infrastructure operators face AI security hardening obligations or near-term compliance pressure; the classified benchmarking framework and voluntary non-federal participation model create enforceability gaps that CISOs at affected organizations should address through internal governance rather than waiting for regulatory extension.