CVE-2026-83999
Improper link resolution before file access ('link following') in Windows Resilient File System (ReFS) Deduplication Service allows an authorized attacker to elevate privileges locally.
Scoring
- Severity
- HIGH
- CVSS base score
- 7
- CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- EPSS probability
- 0.21%
- CWE
- CWE-59
- Published
- 2026-09-08
- Last modified
- 2026-09-11
Affected products
- Microsoft Windows 11 Version 24H2
- Microsoft Windows 11 Version 25H2
- Microsoft Windows 11 version 26H1
- Microsoft Windows Server 2025
- Microsoft Windows Server 2025 (Server Core installation)
Weakness type
Related vulnerabilities
- CVE-2026-88016 — rclone: Directory metadata (chmod/chown/chtimes) applied through a planted symlink in rclone local --links escapes the destination
- CVE-2026-88265 — Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown
- CVE-2026-88264 — Crun: crun: /dev/console symlink follow allows root-owned file creation outside the rootfs
- CVE-2026-87766 — Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup
- CVE-2026-78622 — Improper Link Resolution in Okta Verify for Windows Uninstaller Data Removal
- CVE-2026-81963 — Windows Update Stack Elevation of Privilege Vulnerability
- CVE-2026-69425 — Windows NTFS Tampering Vulnerability
- CVE-2026-69289 — Windows Setup Files Cleanup Elevation of Privilege Vulnerability