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.
CVSS 8.5EPSS 0.182%Risk 0.86
View source- Published
- 2026-06-02 21:16:27
- Affected versions
- <2025.12.5, <2026.2.3, <2026.5.1
- Type
- Package
- Last modified
- 2026-07-22 19:10:00
- Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H