CVE-2026-41569: Goauthentik Authentik

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

authentik is an open-source identity provider. Prior to version 2026.2.3, the WS-Federation provider validates the user-supplied wreply parameter using a raw string prefix check rather than proper URL parsing. An attacker who can craft a login link can supply a wreply value on a different origin that passes the check (e.g. https://portal.example.com.evil.tld/), causing the victim's browser to POST the signed WS-Federation login response to attacker-controlled infrastructure. This issue has been patched in version 2026.2.3.

Affected products

• Goauthentik Authentik: before 2026.2.3 (fixed in 2026.2.3)

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