{"cve":"CVE-2026-55671","nvd":{"published":"2026-07-10T18:16:23.503","modified":"2026-07-14T02:16:56.173","status":"Deferred","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.","cvss_v4":{"vector":"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","score":2.3},"cvss_v3":null,"cwes":["CWE-918"],"references":["https://github.com/zitadel/zitadel/commit/b6f78086913b8d916bce9ab2e049ab0d84f947fd","https://github.com/zitadel/zitadel/releases/tag/v4.15.2","https://github.com/zitadel/zitadel/security/advisories/GHSA-29jh-8cfq-rr8x"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:44:02.134301115+00:00"},"epss":{"cve":"CVE-2026-55671","score":0.00414,"percentile":0.35671,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-29jh-8cfq-rr8x","url":"https://osv.dev/vulnerability/GHSA-29jh-8cfq-rr8x","summary":" ZITADEL: Server-Side Request Forgery (SSRF) and Denylist Bypass in Outgoing HTTP Components","modified":"2026-06-25T18:56:22.822009604Z","packages":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","purl":"pkg:golang/github.com/zitadel/zitadel","ranges":["<1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2"],"fixed":["1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2"]}]},{"id":"GO-2026-5059","url":"https://osv.dev/vulnerability/GO-2026-5059","summary":"ZITADEL: Server-Side Request Forgery (SSRF) and Denylist Bypass in Outgoing HTTP Components in github.com/zitadel/zitadel","modified":"2026-06-25T18:45:14.961667402Z","packages":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","purl":"pkg:golang/github.com/zitadel/zitadel","ranges":["<1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2"],"fixed":["1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}