Description
Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows Server 2012 | 6.2.9200.0 – < 6.2.9200.26026 | 6.2.9200.26026 |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 – < 6.2.9200.26026 | 6.2.9200.26026 |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 – < 6.3.9600.23132 | 6.3.9600.23132 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 – < 6.3.9600.23132 | 6.3.9600.23132 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 – < 10.0.14393.9060 | 10.0.14393.9060 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 – < 10.0.14393.9060 | 10.0.14393.9060 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – < 10.0.17763.8644 | 10.0.17763.8644 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – < 10.0.17763.8644 | 10.0.17763.8644 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – < 10.0.20348.5020 | 10.0.20348.5020 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 – < 10.0.25398.2274 | 10.0.25398.2274 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – < 10.0.26100.32690 | 10.0.26100.32690 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – < 10.0.26100.32690 | 10.0.26100.32690 |
Advisories 3
- WID-SEC-2026-1104 Microsoft Windows: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 27, 2026
- NCSC-2026-0119 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Apr 15, 2026
- MSRC-CVE-2026-26154 Windows Server Update Service (WSUS) Tampering Vulnerability Microsoft Security Response Center · Apr 14, 2026
References
- Windows Server Update Service (WSUS) Tampering Vulnerability vendor-advisory patch