CVE-2026-41569 — authentik: WS-Federation wreply origin bypass can exfiltrate signed login responses to attacker-controlled endpoints
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…
Published: 2026-06-02 · CVSS: 6.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7