CVE-2026-83646

EUVD-2026-99311
Url redirection to untrusted site ('open redirect') in Active Directory Federation Services (AD FS) allows an authorized attacker to perform spoofing over a network.
Open Redirect
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
4.8 MEDIUM
NETWORK
LOW
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 29.04%
Windows Releases
Platform
Version
Windows 10
1607 (x64, x86)
KB5126868
1809 (x64, x86)
KB5126651
Windows Server 2016
Server Core
KB5126868
Standard
KB5126868
Windows Server 2019
Server Core
KB5126651
Standard
KB5126651
Windows Server 2022
Server Core
KB5126655
Standard
KB5126655
Windows Server 2025
Server Core
KB5126646
Standard
KB5126646
Common Weakness Enumeration
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83646