CVE-2026-41569
Medium
Description
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.
SeverityMedium
CVSS6.1
Exploit probability—
ProductAuthentik
PublishedJun 2, 2026
First seenJun 2, 2026
Weakness typeCWE-601Open redirect
How to fix
Update
- goauthentik authentik2026.2.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| goauthentik authentik | v < 2026.2.3 | 2026.2.3 |
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