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Microsoft has issued a bug-related update. The bug affects File Explorer in recent builds of Windows 11.

Last week Microsoft issued an update advisory notice on a Windows 11 problem that happens when users try to access shared files and folders. In some cases, those using File Explorer may not be able to find the information they are looking for, and the explorer app will continue to draw CPU power even after they close out of “Effective Access” in the “Advanced Security Settings” dialog box.

The problem affects systems running Windows 11 versions 21H2 or 22H2 that had the KB5026368 and KB5026372 updates from May 9 installed.

The problem can also occur on Windows Server 2022, according to Microsoft.

Here’s how the bug presents

“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”, Microsoft’s advisory explains.

“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”, the notice continues.

The update also states that “this issue is unlikely to be experienced by consumers using Windows devices in their home”. This is because Effective Access tends to be used in corporate settings.

A workaround is available

Microsoft does suggest a workaround for this bug. “If you have attempted to view effective access, you can mitigate the CPU usage issue by restarting your device or by signing out for the affected user” the notice says.

Users are also cautioned that locking Windows will not mitigate this issue; they must sign out.

Microsoft says it is working on a resolution and estimates that a solution will be available “in late June 2023”.