December 18, 2025—KB5074977 (Monthly Rollup) Out-of-band

December 18, 2025—KB5074977 Monthly Rollup Out-of-band Applies To Windows Server 2008 R2 Premium Assurance Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices have started expiring in June 2026. This might affect the ability of certain...