CVE-2026-55671: zitadel Server-Side Request Forgery (SSRF)

Vulnerability summary

CVE-2026-55671 is a low (CVSS 2.3) Server-Side Request Forgery (SSRF) vulnerability in zitadel. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34.5% of scored vulnerabilities.

Timeline

1. 10-07-2026
   PublishedVulnerability first disclosed.
2. 14-07-2026
   Last modifiedVulnerability information updated.

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.

• CWE-918Server-Side Request Forgery (SSRF)The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.