CVE-2026-47201 HIGH

CVE-2026-47201: authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary federated user

Vendor Goauthentik
Product authentik
Weakness CWE-20 · Input validation
Published June 2, 2026
Last update June 3, 2026
View on NVD All CVEs

CVSS base score

8.5/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 2, 2026 CVE published
June 3, 2026 Record updated