CVE-2026-50684

Analyzed Analyzed - Analysis Complete

Cross-Site Scripting in Active Directory Federation Services

Publication date: 2026-07-14

Last updated on: 2026-07-21

Assigner: Microsoft Corporation

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-14

Last Modified

2026-07-21

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-50684

EUVD

EUVD-2026-44134

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9339 (exc)
microsoft	windows_10_1607	to 10.0.14393.9339 (exc)
microsoft	windows_10_1809	to 10.0.17763.9020 (exc)
microsoft	windows_10_1809	to 10.0.17763.9020 (exc)
microsoft	windows_server_2016	to 10.0.14393.9339 (exc)
microsoft	windows_server_2019	to 10.0.17763.9020 (exc)
microsoft	windows_server_2022	to 10.0.20348.5386 (exc)
microsoft	windows_server_2025	to 10.0.26100.33158 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This is a cross-site scripting (XSS) vulnerability in Active Directory Federation Services (AD FS). It occurs when user input is not properly neutralized during web page generation, allowing an attacker to inject malicious scripts. An authorized attacker can exploit this to perform spoofing attacks over a network.

Detection Guidance

Detecting this XSS vulnerability in AD FS may require monitoring web traffic for suspicious input patterns or reviewing server logs for unusual activity. Check for unexpected script tags or encoded characters in HTTP requests targeting AD FS endpoints.

Impact Analysis

An attacker could trick users into revealing sensitive information or performing unintended actions by injecting malicious scripts into web pages. This may lead to session hijacking, data theft, or unauthorized access to user accounts if exploited.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations may face legal penalties, reputational damage, and loss of compliance certifications.

Mitigation Strategies

Apply the latest security updates from Microsoft for AD FS immediately. Review and restrict user permissions to reduce attack surface. Monitor network traffic for signs of exploitation and consider deploying a web application firewall to filter malicious inputs.

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