OS Build 10240.18967
IMPORTANT As of 9/12/2023, this KB is no longer available from Windows Update, the Microsoft Update Catalog, or other release channels. We recommend that you update your devices to the latest security quality update.
Updates to improve Windows OLE (compound documents) security.
Updates for verifying usernames and passwords.
Updates for storing and managing files.
Improvements and fixes
This security update includes quality improvements. Key changes include:
Security updates to the Microsoft Scripting Engine, Windows App Platform and Frameworks, Windows Cloud Infrastructure, Windows Authentication, Windows Fundamentals, Windows Virtualization, Windows HTML Platform, and Windows Storage and Filesystems.
If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.
For more information about the resolved security vulnerabilities, please refer to the new Security Update Guide website.
Windows Update Improvements
Microsoft has released an update directly to the Windows Update client to improve reliability. Any device running Windows 10 configured to receive updates automatically from Windows Update, including Enterprise and Pro editions, will be offered the latest Windows 10 feature update based on device compatibility and Windows Update for Business deferral policy. This doesn't apply to long-term servicing editions.
Known issues in this update
After installing this or later updates, apps accessing event logs on remote devices might be unable to connect. This issue might occur if the local or remote has not yet installed updates released June 8, 2021 or later. Affected apps are using certain legacy Event Logging APIs. You might receive an error when attempting to connect, for example:
Note Event Viewer and other apps using current non-legacy APIs to access event logs should not be affected.
This is expected due to security hardening changes relating to Event Tracing for Windows (ETW) for CVE-2021-31958. This issue is resolved if the local and remote devices both have installed updates released June 8, 2021 or later.
How to get this update
This update is no longer available.