Description
An elevation of privilege vulnerability exists in the Windows Installer when the Windows Installer fails to properly sanitize input leading to an insecure library loading behavior.
A locally authenticated attacker could run arbitrary code with elevated system privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
The security update addresses the vulnerability by correcting the input sanitization error to preclude unintended elevation.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 – < 10.0.14393.9688 | 10.0.14393.9688 |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 – < 10.0.17763.9487 | 10.0.17763.9487 |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 – < 10.0.19044.7846 | 10.0.19044.7846 |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 – < 10.0.19045.7846 | 10.0.19045.7846 |
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0 – < 10.0.22631.7711 | 10.0.22631.7711 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – < 10.0.26100.9974 | 10.0.26100.9974 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 – < 10.0.26200.9974 | 10.0.26200.9974 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – < 10.0.28000.3501 | 10.0.28000.3501 |
| Microsoft | Windows 11 Version 26H2 | 10.0.26300.0 – < 10.0.26300.9974 | 10.0.26300.9974 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 – < 10.0.14393.9688 | 10.0.14393.9688 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 – < 10.0.14393.9688 | 10.0.14393.9688 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – < 10.0.17763.9487 | 10.0.17763.9487 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – < 10.0.17763.9487 | 10.0.17763.9487 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – < 10.0.20348.5870 | 10.0.20348.5870 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – < 10.0.26100.33822 | 10.0.26100.33822 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – < 10.0.26100.33822 | 10.0.26100.33822 |
Advisories 2
- WID-SEC-2026-4478 Microsoft Windows: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026
- MSRC-CVE-2026-105507 Windows Installer Elevation of Privilege Vulnerability Microsoft Security Response Center · Nov 10, 2026
References
- Windows Installer Elevation of Privilege Vulnerability vendor-advisory patch