Input validation error in Windows Server - CVE-2026-33826
Published: April 15, 2026
Vulnerability identifier: #VU126209
CSH Severity: Medium
CVSS v4: 8.6 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33826
CWE-ID: CWE-20
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the system.
The vulnerability exists due to insufficient validation of user-supplied input in Windows Active Directory. A remote user on the local network can pass specially crafted input to the application and execute arbitrary code on the target system.
Affected software
Windows Server
How to mitigate CVE-2026-33826
Install updates from vendor's website.
Windows Server - addressed in versions 2012 R2 6.3.9600.23132, 2016 10.0.14393.9060, 2019 10.0.17763.8644, 2022 23H2 10.0.25398.2274, 2022 10.0.20348.5020, 2025 10.0.26100.32690