CVE-2026-41569 MEDIUM

CVE-2026-41569: authentik: WS-Federation wreply origin bypass can exfiltrate signed login responses to attacker-controlled endpoints

Vendor Goauthentik
Product authentik
Weakness CWE-601 · Open redirect
Published June 2, 2026
Last update June 3, 2026
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 2, 2026 CVE published
June 3, 2026 Record updated