CVE-2026-83999 | Microsoft Windows 11 24H2/11 25H2/11 26H1/Server 2025 ReFS Deduplication Service privileges management

A vulnerability was found in Microsoft Windows 11 24H2/11 25H2/11 26H1/Server 2025 and classified as very critical. Affected by this issue is some unknown functionality of the component ReFS Deduplication Service. Such manipulation leads to improper privilege management.

This vulnerability is listed as CVE-2026-83999. The attack must be carried out locally. There is no available exploit.

It is advisable to implement a patch to correct this issue.VulDB Recent EntriesRead More