https://www.bleepingcomputer.com/news/microsoft/windows-10-cumulative-updates-released-with-fix-for-windows-media-player/

The December 2018 cumulative updates are now available for supported versions of Windows 10. Today's update for Windows 10 has addressed the security and non-security issues.

To grab the new updates, open Settings via Start menu or Cortana and navigate to Update & Security -> Windows Update and select Check for updates. If you own multiple PCs or if you would like to patch the PCs manually, you can download and install this update from here.