Vulnerability Description
ZITADEL is an open source identity management platform. From 4.0.0-rc.1 through 4.15.1, ZITADEL's HTTP notification channels, OIDC BackChannel Logout, and SAML metadata URL fetches do not consistently validate user-defined URLs against protected denylist handling, allowing server-side requests to loopback, internal IP, link-local, or redirected endpoints through DNS rebinding, redirects, or protocol downgrades. This issue is fixed in version 4.15.2.
Related Weaknesses (CWE)
References
- https://github.com/zitadel/zitadel/commit/b6f78086913b8d916bce9ab2e049ab0d84f947
- https://github.com/zitadel/zitadel/releases/tag/v4.15.2
- https://github.com/zitadel/zitadel/security/advisories/GHSA-29jh-8cfq-rr8x
FAQ
What is CVE-2026-55671?
CVE-2026-55671 is a documented vulnerability. ZITADEL is an open source identity management platform. From 4.0.0-rc.1 through 4.15.1, ZITADEL's HTTP notification channels, OIDC BackChannel Logout, and SAML metadata URL fetches do not consistently...
How severe is CVE-2026-55671?
CVSS scoring is not yet available for CVE-2026-55671. Check NVD for updates.
Is there a patch for CVE-2026-55671?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.