CVE-2026-33826 Windows Active Directory Remote Code Execution Vulnerability
An authorized attacker can execute arbitrary code on Windows Server Active Directory via improper input validation over an adjacent network.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-33826?
CVE-2026-33826 is a high-severity code injection vulnerability in Microsoft Windows Server 2012, published on 14 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
Weakness: CWE-20
Which versions are affected by CVE-2026-33826?
It affects 6 products.
Products include Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23h2, Microsoft Windows Server 2025.
How do I fix CVE-2026-33826?
No fix has been published for CVE-2026-33826 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-33826 being exploited?
There is no known exploitation of CVE-2026-33826 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Windows Server 2012
- CVE-2025-59287 Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data
- CVE-2026-69595 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
- CVE-2026-78445 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
- CVE-2026-41089 Windows Netlogon Remote Code Execution Vulnerability
- CVE-2024-43639 Windows KDC Proxy Remote Code Execution Vulnerability
Sources
Also known as GHSA-495g-jr6v-pch8.