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

What is CVE-2026-41569?

CVE-2026-41569 is a medium-severity vulnerability in goauthentik authentik, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-601

Which versions are affected by CVE-2026-41569?

1 open source package ship an affected version, including authentik. It affects 1 product.

Products include Goauthentik Authentik.

How do I fix CVE-2026-41569?

Upgrade authentik to 2026.2.3 or later.

Is CVE-2026-41569 being exploited?

There is no known exploitation of CVE-2026-41569 in the wild and no public exploit code.

Other vulnerabilities in goauthentik authentik

• CVE-2026-49448 authentik: SourceStage bypass via empty POST Critical 9.8
• CVE-2023-46249 authentik potential installation takeover when default admin user is deleted Critical 9.7
• CVE-2022-23555 authentik vulnerable to Improper Authentication via invitation URL token reuse Critical 9.4
• CVE-2026-42849 authentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover Critical 9.3
• CVE-2026-25227 authentik affected by Remote Code Execution via Context Key Injection in PropertyMapping Test Endpoint Critical 9.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-authentik-2026-41569, GHSA-995q-72cw-cfw3.