kb5087544 update

The kb5087544 update is a Windows 10 extended security update released on May 12, 2026. It adds Secure Boot status reporting to the Windows Security app, alerting users before Microsoft's original 2011 Secure Boot certificates begin expiring in June 2026. This update is critical for Windows 10 machines outside normal support, as eligibility for the certificate refresh depends on being on a supported update path. The tag covers discussions about this update's role in turning a firmware-trust problem into a visible issue for users and administrators, highlighting the practical and technical implications of the upcoming certificate expiry.