Description
Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| 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 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
kaleth4/CVE-2026-33826 ★ 1 · Apr 22, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
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-2026-33826 Windows Active Directory Remote Code Execution Vulnerability Microsoft Security Response Center · Apr 14, 2026
References
- Windows Active Directory Remote Code Execution Vulnerability vendor-advisory patch