# CVE-2026-50684: Microsoft AD FS cross-site scripting in web page generation

Source: https://junglewise.ai/threats/cve-2026-50684-microsoft-ad-fs-cross-site-scripting-in-web-page-generation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-14. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-50684 · Severity: medium · CVSS 4.8 · Published 2026-07-14

Microsoft Active Directory Federation Services (AD FS), which provides single sign-on access to applications, contains a security flaw that could allow an attacker to perform spoofing. An attacker with high-level permissions could use this vulnerability to trick users into interacting with malicious content, potentially leading to unauthorized actions or information disclosure. This could impact the integrity of the authentication portal and the trust users place in corporate login pages.

Technologies: [Microsoft Windows 10 Version 1607](https://junglewise.ai/threats/technologies/windows-10-1607), [Microsoft Windows 10 Version 1809](https://junglewise.ai/threats/technologies/windows-10-1809), [Microsoft Windows Server 2012 R2](https://junglewise.ai/threats/technologies/windows-server-2012-r2), [Microsoft Windows Server 2012](https://junglewise.ai/threats/technologies/windows-server-2012), [Microsoft Windows Server 2016](https://junglewise.ai/threats/technologies/windows-server-2016), [Microsoft Windows Server 2019](https://junglewise.ai/threats/technologies/windows-server-2019). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-50684 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-50684 being exploited in the wild.

**How severe is CVE-2026-50684?** Medium severity, with a CVSS score of 4.8, published 14 July 2026.

**Which products and versions are affected?** Microsoft Windows 10 Version 1607 < 10.0.14393.9339; Microsoft Windows 10 Version 1809 < 10.0.17763.9020; Microsoft Windows Server 2012 R2 < 6.3.9600.23291; Microsoft Windows Server 2012 < 6.2.9200.26226; and 2 more.

**Is there a fix for CVE-2026-50684?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-50684 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-50684?** Check whether you run Microsoft Windows 10 Version 1607, Microsoft Windows 10 Version 1809, Microsoft Windows Server 2012 R2 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A cross-site scripting (XSS) vulnerability exists in Active Directory Federation Services (AD FS) due to improper neutralization of input during web page generation. An attacker with high privileges (PR:H) can exploit this over the network by tricking a user into interacting with a malicious link or page (UI:R). Successful exploitation allows the attacker to execute arbitrary script in the context of the user's browser, facilitating spoofing or limited information disclosure. The vulnerability affects multiple versions of Windows and Windows Server, and Microsoft has released security updates to address the issue.

## Affected products

- Microsoft Windows 10 Version 1607 < 10.0.14393.9339
- Microsoft Windows 10 Version 1809 < 10.0.17763.9020
- Microsoft Windows Server 2012 < 6.2.9200.26226
- Microsoft Windows Server 2012 R2 < 6.3.9600.23291
- Microsoft Windows Server 2016 < 10.0.14393.9339
- Microsoft Windows Server 2019 < 10.0.17763.9020

## Timeline

- 2026-07-14: disclosed: Initial publication by Microsoft and NVD

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50684](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50684)

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