Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-83999US | high7.0 | — | ||
Improper link resolution before file access ('link following') in Windows Resilient File System (ReFS) Deduplication Service allows an authorized attacker to elevate privileges loc… | ||||
references
External citations — patches, advisories, analysis.
- CVE-2026-83999 Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability - CSAFself
- CVE-2026-83999 Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability - HTMLself
- Microsoft Support Lifecycleexternal
- Common Vulnerability Scoring Systemexternal
- Microsoft Exploitability Indexexternal
remediations (8)
- FixedWindows 11 Version 24H2 for ARM64-based Systems
10.0.26100.9445:Security Update:https://support.microsoft.com/help/5124008
https://support.microsoft.com/help/5124008 - FixedWindows 11 Version 24H2 for x64-based Systems
10.0.26100.9445:Security Update:https://support.microsoft.com/help/5124008
https://support.microsoft.com/help/5124008 - FixedWindows 11 Version 25H2 for ARM64-based Systems
10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
https://support.microsoft.com/help/5124008 - FixedWindows 11 Version 25H2 for x64-based Systems
10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
https://support.microsoft.com/help/5124008 - FixedWindows 11 Version 26H1 for ARM64-based Systems
10.0.28000.2954:Security Update:https://support.microsoft.com/help/5124012
https://support.microsoft.com/help/5124012 - FixedWindows 11 version 26H1 for x64-based Systems
10.0.28000.2954:Security Update:https://support.microsoft.com/help/5124012
https://support.microsoft.com/help/5124012 - FixedWindows Server 2025
10.0.26100.33438:Security Update:https://support.microsoft.com/help/5122871
https://support.microsoft.com/help/5122871 - FixedWindows Server 2025 (Server Core installation)
10.0.26100.33438:Security Update:https://support.microsoft.com/help/5122871
https://support.microsoft.com/help/5122871
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