CVE-2026-47201: Goauthentik Authentik

High severity, CVSS 8.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Goauthentik Authentik: before 2025.12.6 (fixed in 2025.12.6); from 2026.2.0, before 2026.2.4 (fixed in 2026.2.4); from 2026.5.0, before 2026.5.1 (fixed in 2026.5.1)

Published 2026-06-02. Last modified 2026-07-22.