CVE-2026-47201
Published:June 02, 2026
Updated:July 21, 2026
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.
Affected Packages
https://github.com/goauthentik/authentik.git (GITHUB):
Affected version(s) =version/2026.5.0 <version/2026.5.1Fix Suggestion:
Update to version version/2026.5.1https://github.com/goauthentik/authentik.git (GITHUB):
Affected version(s) =version/2025.12.5 <version/2025.12.6Fix Suggestion:
Update to version version/2025.12.6https://github.com/goauthentik/authentik.git (GITHUB):
Affected version(s) =version/2026.2.3 <version/2026.2.4Fix Suggestion:
Update to version version/2026.2.4Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
9
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
8.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.18