{"id":"CVE-2026-56666","title":"ZITADEL is an open source identity management platform","summary":"ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's external identity provider handler checks that the local user's email is verified but does not verify that the external IdP confirmed ownership of the sam…","severity":"medium","cvss":4.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","cwe":["CWE-287"],"vendor":"zitadel","product":"zitadel","affected":["zitadel < 4.15.3"],"published":"2026-07-10","updated":"2026-07-13","sourceUpdated":"2026-07-13T19:17:23.487","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-56666","references":[{"url":"https://github.com/zitadel/zitadel/commit/c97012f0c5dc2fe960ae6e940cbea23229f0557f","label":"security-advisories@github.com"},{"url":"https://github.com/zitadel/zitadel/releases/tag/v4.15.3","label":"security-advisories@github.com"},{"url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-992q-9gwp-7r79","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56666"},{"url":"https://github.com/zitadel/zitadel"}],"tags":["nvd","cve.org","osv","go"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-13T18:09:40.948313Z"},"ingestedAt":"2026-09-13T03:59:59.172Z","epss":0.00285,"epssPercentile":0.18773,"aliases":["GHSA-992q-9gwp-7r79","GO-2026-6470"],"ecosystem":"go","patched":["github.com/zitadel/zitadel 4.15.3"],"slug":"CVE-2026-56666","body":"## Overview\n\nZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's external identity provider handler checks that the local user's email is verified but does not verify that the external IdP confirmed ownership of the same email before auto-linking by email, allowing a permissive provider account with a victim email address to be linked to the victim's local account. This issue is fixed in version 4.15.3.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-56666)\n\nAffected packages:\n\n- `github.com/zitadel/zitadel < 4.15.3`\n\nPatched in:\n\n- `github.com/zitadel/zitadel 4.15.3`\n\nSource: https://osv.dev/vulnerability/GHSA-992q-9gwp-7r79","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":26.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}