CVE-2026-41569authentik: WS-Federation wreply origin bypass can exfiltrate signed login responses to attacker-controlled endpoints
Updated under an hour ago ()
Does this affect you?
It affects goauthentik authentik. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 6.9 MEDIUM (v4.0, CNA)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
- Weakness (CWE)
- CWE-601
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Jun 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
goauthentik authentik goauthentik:authentik (from the name) | before 2026.2.3 | CNA record |
goauthentik authentik goauthentik:authentik | before 2026.2.3 | NVD |
References
- https://github.com/goauthentik/authentik/security/advisories/GHSA-995q-72cw-cfw3x-refsource-confirm, mitigation, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.