CVE-2026-50684 Active Directory Federation Server Spoofing Vulnerability

Medium 4.8 Published 14 Jul 2026 Updated 28 Oct 2026

An authorized attacker can perform spoofing attacks via cross-site scripting in Active Directory Federation Services.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-50684?

CVE-2026-50684 is a medium-severity cross-site scripting vulnerability in Microsoft Windows 10 1607, published on 14 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official description

Improper neutralization of input during web page generation ('cross-site scripting') in Active Directory Federation Services (AD FS) allows an authorized attacker to perform spoofing over a network.

Weakness: CWE-79

Which versions are affected by CVE-2026-50684?

It affects 7 products.

Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022 and 1 more.

How do I fix CVE-2026-50684?

No fix has been published for CVE-2026-50684 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-50684 being exploited?

There is no known exploitation of CVE-2026-50684 in the wild and no public exploit code.

All Microsoft Windows 10 1607 vulnerabilities

Sources

Also known as GHSA-56v6-8mpw-v7h3.