Today is the second Tuesday of September 2020 and important security updates/cumulative or ‘B’ updates are now available for all supported versions of Windows 10. The updates are available for installation when you check for updates in the Settings and click on ‘Download and install now’ button. The first cumulative update for Windows 10, version 2004 is KB 571756 and it comes with these fixes: Addresses an issue with a possible elevation of privilege in windowmanagement.dll Addresses a security vulnerability issue with user proxies and. HTTP-based intranet servers cannot leverage a user proxy by default to detect updates.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-cumulative-updates-kb4571756-and-kb4574727-released/