Vulnerability Description
authentik is an open-source identity provider. Prior to versions 2025.12.5, 2026.2.3, and 2026.5.1, authentik's SAML Source ACS endpoint is vulnerable to XML Signature Wrapping when validating upstream SAML responses. An attacker with any account at the upstream IdP can reuse a valid signed assertion to authenticate as another federated user. This issue has been patched in versions 2025.12.5, 2026.2.3, and 2026.5.1.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Goauthentik | Authentik | < 2025.12.6 |
Related Weaknesses (CWE)
References
- https://github.com/goauthentik/authentik/security/advisories/GHSA-c3m2-jqmq-pvp3MitigationVendor Advisory
FAQ
What is CVE-2026-47201?
CVE-2026-47201 is a vulnerability with a CVSS score of 8.5 (HIGH). authentik is an open-source identity provider. Prior to versions 2025.12.5, 2026.2.3, and 2026.5.1, authentik's SAML Source ACS endpoint is vulnerable to XML Signature Wrapping when validating upstrea...
How severe is CVE-2026-47201?
CVE-2026-47201 has been rated HIGH with a CVSS base score of 8.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-47201?
Check the references section above for vendor advisories and patch information. Affected products include: Goauthentik Authentik.