{"id":"CVE-2026-55671","summary":"ZITADEL: Server-Side Request Forgery (SSRF) and Denylist Bypass in Outgoing HTTP Components","details":"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.","aliases":["GHSA-29jh-8cfq-rr8x","GO-2026-5059"],"modified":"2026-07-16T03:30:58.773545174Z","published":"2026-07-10T17:17:50.095Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55671.json"},"references":[{"type":"WEB","url":"https://github.com/zitadel/zitadel/releases/tag/v4.15.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55671.json"},{"type":"ADVISORY","url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-29jh-8cfq-rr8x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55671"},{"type":"FIX","url":"https://github.com/zitadel/zitadel/commit/b6f78086913b8d916bce9ab2e049ab0d84f947fd"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zitadel/zitadel","events":[{"introduced":"8f0b7ebf028187e84881694bb931cbe33604e308"},{"fixed":"a1748b2f0326ddf7be0de44b4f980ae2c07c0151"},{"fixed":"b6f78086913b8d916bce9ab2e049ab0d84f947fd"},{"fixed":"c53d9774d4272d3cebeee4131012c20bd77b9dfb"}],"database_specific":{"extracted_events":[{"introduced":"4.0.0-rc.1"},{"fixed":"4.15.1"}],"source":["DESCRIPTION","REFERENCES"]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55671.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}