Weak Authentication in Windows Server - CVE-2026-70005
Published: October 13, 2026
Vulnerability identifier: #VU154496
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70005
CWE-ID: CWE-1390
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass a security feature.
The vulnerability exists due to weak authentication in Active Directory Federation Services (AD FS) when authenticating over a network. A remote attacker can exploit the weak authentication to bypass a security feature.
Successful exploitation is complex and time-consuming, requiring significant effort and precise conditions.
Affected software
Windows Server
How to mitigate CVE-2026-70005
Install security update from vendor's website.
Windows Server - addressed in versions 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650