Advisoriesby IbisMicrosoftCVE-2026-81963
Microsoft Windows Update Stack: privilege escalation
Fix: upgrade to 10.0.22631.7582 or later (5 fixed versions below)
Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Windows 11 Version 23H2 Product | >= 10.0.22631.0, < 10.0.22631.7582 | 10.0.22631.7582 |
| Windows 11 Version 24H2 Product | >= 10.0.26100.0, < 10.0.26100.9445 | 10.0.26100.9445 |
| Windows 11 Version 25H2 Product | >= 10.0.26200.0, < 10.0.26200.9445 | 10.0.26200.9445 |
| Windows 11 version 23H2 Product | >= 10.0.22631.0, < 10.0.22631.7582 | 10.0.22631.7582 |
| Windows 11 version 26H1 Product | >= 10.0.28000.0, < 10.0.28000.2954 | 10.0.28000.2954 |
| Windows Server 2025 Product | >= 10.0.26100.0, < 10.0.26100.33438 | 10.0.26100.33438 |
| Windows Server 2025 (Server Core installation) Product | >= 10.0.26100.0, < 10.0.26100.33438 | 10.0.26100.33438 |