{"id":"CVE-2026-105207","revision":"f295f0fac3124d80af06e2eee8fa9d4e","records":[{"revision":"f295f0fac3124d80af06e2eee8fa9d4e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-105207","aliases":[],"title":"ZITADEL before 4.17.3 Account Takeover via External IdP Linking","description":"ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.17.3 creates links between user accounts and external identity providers without verifying a primary factor or the caller's permission, including on identify-only Login V2 sessions and via the User Service V2 AddIDPLink endpoint. An unauthenticated attacker knowing a victim's login name can bind their own external IdP identity to the victim's account and then sign in as the victim.","state":0,"publishedAt":"2026-10-04T13:10:02.024+00:00","modifiedAt":"2026-10-06T21:58:40.367+00:00","affected":[{"ecosystem":"Vendor product","name":"zitadel","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"zitadel\",\n                    \"product\": \"zitadel\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"4.17.3\"\n                        },\n                        {\n                            \"version\": \"4.17.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"zitadel","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"zitadel\",\n                    \"product\": \"zitadel\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThanOrEqual\": \"4.19.4\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":9.3,"severity":"CRITICAL"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://github.com/zitadel/zitadel/security/advisories/GHSA-g8gj-gq47-xgf4","https://www.vulncheck.com/advisories/zitadel-before-4.17.3-account-takeover-via-external-idp-linking"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-105207","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-105207","identifiers":["CVE-2026-105207"]},"retained":false,"historicalAffected":[]}],"coverage":[]}