CVE-2026-41569
authentik: WS-Federation wreply origin bypass can exfiltrate signed login responses to attacker-controlled endpoints
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
15th
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.
| CWE | CWE-601 |
| Vendor | goauthentik |
| Product | authentik |
| Published | Jun 2, 2026 |
| Last Updated | Jun 3, 2026 |
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Affected Versions
goauthentik / authentik
< 2026.2.3