December 9, 2025—KB5071546 (OS Builds 19045.6691 and 19044.6691)

December 9, 2025—KB5071546 OS Builds 19045.6691 and 19044.6691 Windows Secure Boot certificate expirationImportant: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. Microsoft has been updating these certificates on consumer and non-managed business...