CVE-2026-69982

Analyzed Analyzed - Analysis Complete

Authentication Bypass in Active Directory Federation Services

Publication date: 2026-10-13

Last updated on: 2026-10-26

Assigner: Microsoft Corporation

Description

Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to bypass a security feature over a network.

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-26

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-69982

EUVD

EUVD-2026-99667

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
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_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	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)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1390	The product uses an authentication mechanism to restrict access to specific users or identities, but the mechanism does not sufficiently prove that the claimed identity is correct.

Attack-Flow Graph

Executive Summary

This vulnerability involves weak authentication in Active Directory Federation Services (AD FS) that allows an unauthorized attacker to bypass a security feature over a network.

Impact Analysis

An attacker could exploit this to bypass authentication, potentially gaining unauthorized access to systems or data protected by AD FS. This may lead to data breaches or unauthorized actions within affected environments.

Compliance Impact

This vulnerability could lead to unauthorized access, potentially violating data protection requirements under GDPR or HIPAA. Organizations may face compliance penalties if sensitive data is exposed due to the bypass.

Mitigation Strategies

Apply the latest security updates from Microsoft for AD FS to address the weak authentication issue. Monitor Microsoft's advisory for patches and follow their recommended mitigation steps.

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