[English]Microsoft has fixed the Effective Access issue in Explorer with the Windows 11 22H2 Preview update KB5027303, dated June 27, 2023. The issue was caused by the May 2023 security updates for Windows 11 and Windows Server 2022.
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The Effective Access issue in Explorer
I've covered the issue on May 27, 2023, in the blog post Windows: Patchday issues and fixes in May 2023 (Server 2022 effective access query, VPN) what administrators reported to me right after the May 2023 patchday. Windows Server 2022 cumulative update KB5026370 prevents Explorer from querying effective permissions. A German user described it as:
After installing the KB5026370 update, I can no longer query effective permissions via Windows Server 2022. Windows Explorer loads the CPU, but nothing happens. Has anyone else experienced this problem? Unpatched Server 2022 behaves correctly and as usual in that regard.
The problem was confirmed by other users and Microsoft later documented the whole thing as a bug (see Windows 11/Server 2022: Effective Access bug in Explorer confirmed). The bug affects Windows Server 2022 and Windows 11.
Microsoft fixes the bug
In a June 21, 2023 entry Computing effective access might not show results the issue was confirmed as fixed as of June 27, 2023 in the Windows 11 22H2 Release Health-Dashboard. There Microsoft says:
Resolution: This issue has been addressed for devices running Windows 11, version 22H2 in updates released on June 27, 2023 (KB5027303) and later. This issue will be resolved on other affected Windows versions in updates that will be released in the near term.
The July 2023 security updates will correct the issue for the remaining Windows systems (Windows Server 2022, Windows 11 21H2).
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