CVE-2026-55671: Zitadel

Low severity, CVSS 2.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Zitadel Zitadel: before 4.15.2 (fixed in 4.15.2)

Published 2026-07-10. Last modified 2026-07-14.