{"schema":"threatline.record/2","record":{"id":"CVE-2026-105207","aliases":["GHSA-g8gj-gq47-xgf4"],"summary":"ZITADEL before 4.17.3 Account Takeover via External IdP Linking","details":"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.","categories":["Unclassified"],"product":"zitadel","vendor":"zitadel","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105207","source_modified_at":"2026-10-06T21:58:40.367Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"zitadel","vendor":"zitadel","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"4.17.3"},{"version":"4.17.3","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105207","source_modified_at":"2026-10-06T21:58:40.367Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"zitadel","vendor":"zitadel","versions":[{"version":"0","status":"affected","versionType":"semver","lessThanOrEqual":"4.19.4"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105207","source_modified_at":"2026-10-06T21:58:40.367Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"zitadel","ecosystem":null},"version":"4.17.3","basis":"first unaffected version stated in the CVE record"}],"cvss":9.3,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.0031,"percentile":0.22688,"score_date":"2026-10-23"},"published_at":"2026-10-04T13:10:02.024Z","modified_at":"2026-10-06T21:58:40.367Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-105207","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-06T21:58:40.367Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-105207","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-g8gj-gq47-xgf4","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/zitadel-before-4.17.3-account-takeover-via-external-idp-linking","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"total","assessed_at":"2026-10-06T21:58:30.918285Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-06T21:58:40.367Z","content_hash":"084dcf30dd34a600f703473fe83ee58d1300b6f2169004bc46b7ed7d6e230241"}}