CVE-2026-47201
Analyzed Analyzed - Analysis Complete
XML Signature Wrapping in authentik SAML Source

Publication date: 2026-06-02

Last updated on: 2026-06-04

Assigner: GitHub, Inc.

Description
authentik is an open-source identity provider. Prior to versions 2025.12.5, 2026.2.3, and 2026.5.1, authentik's SAML Source ACS endpoint is vulnerable to XML Signature Wrapping when validating upstream SAML responses. An attacker with any account at the upstream IdP can reuse a valid signed assertion to authenticate as another federated user. This issue has been patched in versions 2025.12.5, 2026.2.3, and 2026.5.1.
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Meta Information
Published
2026-06-02
Last Modified
2026-06-04
Generated
2026-06-23
AI Q&A
2026-06-03
EPSS Evaluated
2026-06-21
NVD
CVE-2026-47201
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
goauthentik authentik to 2025.12.6 (exc)
goauthentik authentik From 2026.2.0 (inc) to 2026.2.4 (exc)
goauthentik authentik From 2026.5.0 (inc) to 2026.5.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-347 The product does not verify, or incorrectly verifies, the cryptographic signature for data.
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
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Executive Summary

The vulnerability affects authentik's SAML Source ACS endpoint prior to versions 2025.12.5, 2026.2.3, and 2026.5.1. It is an XML Signature Wrapping issue that occurs when validating upstream SAML responses.

An attacker who has any account at the upstream Identity Provider (IdP) can exploit this vulnerability by reusing a valid signed assertion to authenticate as another federated user.

This means the attacker can impersonate other users without having their credentials.

Impact Analysis

This vulnerability can have severe impacts because it allows an attacker with limited privileges to authenticate as any other federated user.

  • Unauthorized access to sensitive data or systems.
  • Potential full compromise of user accounts within the federated environment.
  • Loss of trust in the authentication system.
  • Possible disruption of services due to unauthorized actions.
Mitigation Strategies

To mitigate this vulnerability, you should upgrade authentik to one of the patched versions: 2025.12.5, 2026.2.3, or 2026.5.1.

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