Windows 11 21H2, 22H2 and Server 2022 are affected by a new bug, introduced with KB5026372. It was released on May 9, 2023. After installing the patch, you will run into high CPU load after trying to view Effective Access in the Advanced Security Options of File Explorer.
In essence, an Effective Permission refers to the permissions granted by the combination of default NTFS permissions and permissions applied to a specific file or folder. In simpler terms, it represents the actual extent of a user's capabilities and access.
To view Effective Access for a file or folder in Windows Explorer, right-click the file or folder, go to Properties > Security > Advanced > Effective Permissions. Enter the user or group name and click OK to see their permissions.
If you try to do the above on Windows Build 22621.1702, it will cause high CPU load. Microsoft describes the issue as follows:
After installing updates released on May 9, 2023 or later updates, you might be unable to view Effective Access in the "Advanced Security Settings" dialog for shared files or folders. On affected devices, when the "View effective access" button is selected, you will receive the message "Computing effective access...." but the results of the query might not be displayed and explorer.exe might continue to use CPU after the Advanced Security settings dialog is closed. This issue is unlikely to be experienced by consumers using Windows devices in their home.
As a workaround, you can only sign out or to restart the computer. Microsoft is working on a fix.
Source: Microsoft
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