Microsoft has released the Windows 10 1909 KB5000850 cumulative update preview and a new KB5001205 Servicing Stack Update that resolves a Secure Boot vulnerability. The SSU fixes an issue that causes the CVE-2020-0689 Secure Boot security update not to be installed. Microsoft Edge Legacy will be removed and replaced by the new Chromium-based Microsoft Edge. The new Microsoft Edge replacement will be coming to all users with the April 2021 Patch Tuesday updates. In addition to the various fixes and improvements in this release, Microsoft also shared the following known issues.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-releases-windows-10-ssu-to-fix-security-update-issue/