CVE-2026-83999

Summary

Improper link resolution before file access ('link following') in Windows Resilient File System (ReFS) Deduplication Service allows an authorized attacker to elevate privileges locally.

Affected Software

VendorProductVersion RangeStatus
MicrosoftWindows 11 Version 24H210.0.26100.0 < 10.0.26100.9445affected
MicrosoftWindows 11 Version 25H210.0.26200.0 < 10.0.26200.9445affected
MicrosoftWindows 11 version 26H110.0.28000.0 < 10.0.28000.2954affected
MicrosoftWindows Server 202510.0.26100.0 < 10.0.26100.33438affected
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 < 10.0.26100.33438affected

Weaknesses

  • CWE-59: CWE-59: Improper Link Resolution Before File Access ('Link Following')

References