Cyber: New Microsoft Release Windows 10 Kb5075912 Extended Security Update

Microsoft has released the Windows 10 KB5075912 extended security update to fix February 2026 Patch Tuesday vulnerabilities, including six zero-days, and continue rolling out replacements for expiring Secure Boot certificates.

If you are running Windows 10 Enterprise LTSC or are enrolled in the ESU program, you can install this update like normal by going into Settings, clicking on Windows Update, and manually performing a 'Check for Updates.'

After installing this update, Windows 10 will be updated to build 19045.6937, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.6937.

Microsoft is no longer releasing new features for Windows 10, and the KB5075912 update contains only security fixes and bug fixes introduced by previous security updates.

With today's February 2026 Patch Tuesday, Microsoft has fixed 58 vulnerabilities, including six actively exploited zero-day flaws.

KB5075912 also fixes a known issue that prevented Windows 10 devices from shutting down or hibernating if System Guard Secure Launch is enabled.

Since June 2025, Microsoft has warned that multiple Windows Secure Boot certificates from 2011 are expiring in June 2026, and warned that if they are not updated, it would breach Secure Boot protections.

These certificates are used to validate Windows boot components, third-party bootloaders, and Secure Boot revocation updates, and if expired, could allow threat actors to bypass security protections.

As part of today's update, Microsoft continues to roll out the new Secure Boot certificates to targeted systems, with updates to additional systems being installed as the targeting scope expands.

Microsoft states that there are no known issues with this update.

Source: BleepingComputer