Like all other versions of Windows 10 and 11, Windows 10 1909 also received a new security update. The update comes with KB number 5012591. After installing the update, it will up your build number to build 18363.2212.

The new update is for use on Windows 10 Enterprise, version 1909 Windows 10 Enterprise, and Education, version 1909.

Changelog for KB5012591 Windows 10 1909

  • This update contains miscellaneous security improvements to internal OS functionality. No additional issues were documented for this release.

If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.

For more information about security vulnerabilities, please refer to the new Security Update Guide website and the April 2022 Security Updates.

You must install July 13, 2021, SSU (KB5004748) before installing the LCU. 

Download: Security-Update