CVE-2026-96222

Analyzed Analyzed - Analysis Complete

Improper Certificate Validation in AD FS Allows Spoofing

Publication date: 2026-10-13

Last updated on: 2026-10-22

Assigner: Microsoft Corporation

Description

Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-22

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-96222

EUVD

EUVD-2026-99750

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	.net	From 8.0.0 (inc) to 8.0.5 (exc)
microsoft	visual_studio_2022	From 17.14.0 (inc) to 17.14.42 (exc)
microsoft	visual_studio_2026	From 18.10.0 (inc) to 18.10.4 (exc)
microsoft	.net_framework	4.8.1
microsoft	.net_framework	4.8
microsoft	.net_framework	4.6.2
microsoft	.net_framework	4.7
microsoft	.net_framework	4.7.1
microsoft	.net_framework	4.7.2
microsoft	.net_framework	3.5

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-295	The product does not validate, or incorrectly validates, a certificate.

Attack-Flow Graph

Executive Summary

This vulnerability involves improper certificate validation in Active Directory Federation Services (AD FS). An unauthorized attacker can exploit this to perform spoofing attacks over a network, potentially impersonating legitimate services or users.

Detection Guidance

Detecting this vulnerability requires checking AD FS configurations and certificate validation processes. Monitor AD FS logs for unusual certificate validation failures or spoofing attempts. Use PowerShell commands like Get-AdfsCertificate to review certificates and Get-WinEvent to analyze security logs for anomalies.

Impact Analysis

An attacker could impersonate trusted services or users, leading to unauthorized access to sensitive data, privilege escalation, or bypassing security controls. This may result in data breaches, service disruption, or compliance violations.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating confidentiality requirements in GDPR and HIPAA. Organizations may face fines, legal penalties, or reputational damage due to non-compliance.

Mitigation Strategies

Apply the latest security updates from Microsoft for AD FS and related components. Monitor Microsoft's security advisories for patches and follow their guidance for certificate validation fixes.

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