CVE-2026-70005
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Authentication Bypass in Active Directory Federation Services

Publication date: 2026-10-13

Last updated on: 2026-10-14

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.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-14
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
CVE-2026-70005
EUVD
EUVD-2026-99668

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
Microsoft Windows Server 2019 10.0.17763.0
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0
Microsoft Windows Server 2022 10.0.20348.0
Microsoft Windows Server 2025 10.0.26100.0
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE
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KEV
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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.

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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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