Improper Certificate Validation in Windows Server - CVE-2026-105590
Published: November 10, 2026
Vulnerability identifier: #VU164701
CSH Severity: Low
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-105590
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to bypass a security feature in Windows Active Directory Certificate Services.
The vulnerability exists due to improper certificate validation in Windows Active Directory Certificate Services when validating certificates over a network. A remote user can supply a certificate that is not properly validated to bypass a security feature.
Affected software
Windows Server
How to mitigate CVE-2026-105590
Install security update from vendor's website.
Windows Server - addressed in versions 2016 10.0.14393.9688, 2019 10.0.17763.9487, 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822