October 14, 2025—KB5066836 (OS Build 14393.8519)

October 14, 2025—KB5066836 OS Build 14393.8519 Applies To Windows 10, version 1607, all editions Windows Server 2016, all editions Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices have started expiring in June 2026. This might affect the...