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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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-c3m2-jqmq-pvp3 authentik's XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 04 Jun 2026 20:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-347
CPEs cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*

Wed, 03 Jun 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 03 Jun 2026 04:30:00 +0000

Type Values Removed Values Added
First Time appeared Goauthentik
Goauthentik authentik
Vendors & Products Goauthentik
Goauthentik authentik

Wed, 03 Jun 2026 02:30:00 +0000

Type Values Removed Values Added
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.
Title authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user
Weaknesses CWE-20
References
Metrics cvssV3_1

{'score': 8.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-03T14:08:11.139Z

Reserved: 2026-05-18T22:07:37.436Z

Link: CVE-2026-47201

cve-icon Vulnrichment

Updated: 2026-06-03T13:58:11.896Z

cve-icon NVD

Status : Analyzed

Published: 2026-06-02T21:16:27.940

Modified: 2026-06-04T20:14:17.090

Link: CVE-2026-47201

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-04T22:00:14Z

Weaknesses