What’s Vulnerable › Vulnerabilities
CVE-2026-41569: authentik: WS-Federation wreply origin bypass can exfiltrate signed login responses to attacker-controlled endpoints
- Severity: medium (CVSS 6.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-02 · updated 2026-07-22
- Weakness: CWE-601
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.
Affected products
- goauthentik authentik: before 2026.2.3 — fixed in 2026.2.3
How to fix
Upgrade to a fixed version: goauthentik authentik 2026.2.3. Check the vendor advisory for mitigations.
References
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