Cross-site scripting in Microsoft Windows and Windows Server - CVE-2026-50684
Published: July 17, 2026
Vulnerability identifier: #VU138095
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-50684
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform spoofing.
The vulnerability exists due to cross-site scripting in Active Directory Federation Services (AD FS) when generating web pages. A remote user can inject crafted input to perform spoofing.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-50684
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 1607 10.0.14393.9339, 10 1809 10.0.17763.9020, 11 26H1 10.0.28000.2525
Windows Server - addressed in versions 2012 R2 6.3.9600.23291, 2012 6.2.9200.26226, 2016 10.0.14393.9339, 2019 10.0.17763.9020, 2022 10.0.20348.5386, 2025 10.0.26100.33158
Windows Server - addressed in versions 2012 R2 6.3.9600.23291, 2012 6.2.9200.26226, 2016 10.0.14393.9339, 2019 10.0.17763.9020, 2022 10.0.20348.5386, 2025 10.0.26100.33158