December 18, 2025—KB5074976 (OS Builds 19044.6693 and 19045.6693) Out-of-band

December 18, 2025—KB5074976 OS Builds 19044.6693 and 19045.6693 Out-of-band Applies To Windows 10 ESU Windows 10 Enterprise LTSC 2021 Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices have started expiring in June 2026. This might affect t...