CVE-2026-70005

Analyzed Analyzed - Analysis Complete

Authentication Bypass in Active Directory Federation Services

Publication date: 2026-10-13

Last updated on: 2026-10-28

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

2026-10-28

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-70005

EUVD

EUVD-2026-99668

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (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. It is classified as a security feature bypass issue.

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 the network.

Compliance Impact

This vulnerability could lead to unauthorized access, which may violate compliance requirements for data protection and security, such as GDPR or HIPAA. Organizations may face penalties or legal consequences if this vulnerability is exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the AD FS authentication weakness. Monitor Microsoft's update guide for specific patches and follow their recommended mitigation steps.

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