Vulnerability · Published Jun 2, 2026 · Assigned by GitHub_M

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

Medium 6.9

In plain English

A medium-severity open redirect in authentik from goauthentik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.2%top 93.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
goauthentik	authentik	< 2026.2.3

Weakness: CWE-601 · 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

References

https://github.com/goauthentik/authentik/security/advisories/GHSA-995q-72cw-cfw3 x_refsource_CONFIRM