CVE-2026-81963
Windows Update Stack Elevation of Privilege Vulnerability
CVSS Score
7.8
EPSS Score
0.6%
EPSS Percentile
48th
Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.
| Vendor | microsoft |
| Product | windows 11 version 23h2 |
| Ecosystems | |
| Industries | TechnologyEnterprise |
| Published | Sep 8, 2026 |
| Last Updated | Sep 15, 2026 |
⚠️ Actively Exploited — Act Now
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CVSS v3 Breakdown
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 Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Microsoft / Windows 11 version 23H2
10.0.22631.0 < 10.0.22631.7582
Microsoft / Windows 11 Version 23H2
10.0.22631.0 < 10.0.22631.7582
Microsoft / Windows 11 Version 24H2
10.0.26100.0 < 10.0.26100.9445
Microsoft / Windows 11 Version 25H2
10.0.26200.0 < 10.0.26200.9445
Microsoft / Windows 11 version 26H1
10.0.28000.0 < 10.0.28000.2954
Microsoft / Windows Server 2025
10.0.26100.0 < 10.0.26100.33438
Microsoft / Windows Server 2025 (Server Core installation)
10.0.26100.0 < 10.0.26100.33438