October 23, 2025—KB5070879 (OS Build 25398.1916) Out-of-band

October 23, 2025—KB5070879 OS Build 25398.1916 Out-of-band Applies To Windows Server, version 23H2 Windows Secure Boot certificate expiration Secure Boot certificates used by most Windows devices have started expiring in June 2026. This might affect the ability of certain personal and business...

October 23, 2025—KB5070884 (OS Build 20348.4297) Out-of-band

October 23, 2025—KB5070884 OS Build 20348.4297 Out-of-band Applies To Windows Server 2022 Windows Secure Boot certificate expiration Secure Boot certificates used by most Windows devices have started expiring in June 2026. This might affect the ability of certain personal and business devices to...