CVE-2026-55671 | THREATINT

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.

PUBLISHED Reserved 2026-06-17 | Published 2026-07-10 | Updated 2026-07-14 | Assigner GitHub_M

LOW: 2.3CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-918: Server-Side Request Forgery (SSRF)

Product status

< 4.15.2

affected

References

github.com/...itadel/security/advisories/GHSA-29jh-8cfq-rr8x

github.com/...ommit/b6f78086913b8d916bce9ab2e049ab0d84f947fd

github.com/zitadel/zitadel/releases/tag/v4.15.2

cve.org (CVE-2026-55671)

nvd.nist.gov (CVE-2026-55671)

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