Windows 10 20H2 Build 19042.508 (KB4571756) for Insider

[German]On Patchday (September 8, 2020) Microsoft released the update KB4571756 not only for Windows 10 Version 2004. The update is also available for Windows insiders in the Beta Channel for testing.


In Windows 10 20H1 and 20H2 Microsoft follows the same approach as in Windows 10 version 190x. Both Windows 10 versions (2004 and 20H2) receive the same update packages. The announcement was made in the Windows blog; the update is also available for testing by corporate customers from the Windows Insider program in the Release Preview Channel. Update KB4571756 upgrades Windows 10 version 20H2 to OS build 19042.508 and includes the following fixes.

  • We fixed an issue with a possible elevation of privilege in windowmanagement.dll.
  • We fixed a security vulnerability issue with user proxies and HTTP-based intranet servers. After installing this update, HTTP-based intranet servers cannot leverage a user proxy by default to detect updates. Scans using these servers will fail if the clients do not have a configured system proxy. If you must leverage a user proxy, you must configure the behavior using the Windows Update policy "Allow user proxy to be used as a fallback if detection using system proxy fails." This change does not affect customers who secure their Windows Server Update Services (WSUS) servers with the Transport Layer Security (TLS) or Secure Sockets Layer (SSL) protocols. For more information, see Improving security for devices receiving updates via WSUS.
  • Security updates to Windows App Platform and Frameworks, Microsoft Graphics Component, Windows Input and Composition, Windows Media, Windows Shell, Windows Cloud Infrastructure, Windows Fundamentals, Windows Management, Windows Kernel, Windows Virtualization, Windows Storage and Filesystems, and the Microsoft JET Database Engine.

This update is offered via Windows Update on machines in the Windows Insider program.

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