Windows 10 KB5078885 ESU out with Secure Boot 2023, replacing expiring Secure Boot certificates from 2011. But it's a staged roll out.
Microsoft confirms systems without updated Secure Boot certificates will boot normally but lose some security protections.
Make sure you've updated before the deadline.
Microsoft is rolling out "Secure Boot Allowed Key Exchange Key (KEK) Update," which requires a system reboot to finish ...