August 8, 2017—KB4034668 (OS Build 10240.17533)

Improvements and fixes

This update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:

Addressed issue where some of the event data for user logon events (ID 4624) from Domain controllers were corrupted.
Addressed issue introduced in the June updates where some applications may not launch when a device resumes from Connected Standby mode.
Security updates to Microsoft Scripting Engine, Microsoft Edge, Internet Explorer, Microsoft Windows Search Component, Microsoft Graphics Component, Windows kernel-mode drivers, Microsoft Windows PDF Library, Windows Server, Common Log File System Driver, Windows Hyper-V, and the Microsoft JET Database Engine.

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, see the Security Update Guide.

Windows Update Client Improvement

Microsoft will release an update directly to the Windows Update Client to improve Windows Update reliability. It will only be offered to devices that have not installed the most recent updates and are not currently managed (e.g. domain joined).

Known issues in this update

Microsoft is not currently aware of any issues with this update.

How to get this update

This update will be downloaded and installed automatically from Windows Update. To get the standalone package for this update, go to the Microsoft Update Catalog website.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4034668.