CVE-2026-81963

Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.

Scoring

Severity

HIGH

CVSS base score

7.8

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CISA KEV

Known exploited vulnerability

CWE

CWE-59, CWE-284

Published

2026-09-08

Last modified

2026-09-09

Affected products

• Microsoft Windows 11 version 23H2
• Microsoft Windows 11 Version 23H2
• 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

• CWE-59
• CWE-284

Related vulnerabilities

• 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-2026-69425 — Windows NTFS Tampering Vulnerability
• CVE-2026-69289 — Windows Setup Files Cleanup Elevation of Privilege Vulnerability
• CVE-2026-83999 — Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability
• CVE-2026-70563 — Windows Shell Spoofing Vulnerability
• CVE-2026-69771 — Windows Container Manager Service Security Feature Bypass Vulnerability
• CVE-2026-69379 — Windows NTFS Elevation of Privilege Vulnerability

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