{"schema":"threatline.record/2","record":{"id":"CVE-2026-105215","aliases":["GHSA-738m-7888-jfv8"],"summary":"ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback","details":"ZITADEL before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 UI because the 'external account not found' registration endpoint trusts client-supplied external identity fields without a completed IdP callback. Unauthenticated attackers can submit forged IDPConfigID and ExternalUserID values to pre-create an account bound to a victim's external IdP identity, which the victim's later genuine external login then signs into.","categories":["Unclassified"],"product":"zitadel","vendor":"zitadel","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105215","source_modified_at":"2026-10-05T13:28:36.853Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"zitadel","vendor":"zitadel","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"4.16.2"},{"version":"4.16.2","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105215","source_modified_at":"2026-10-05T13:28:36.853Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"zitadel","vendor":"zitadel","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"3.4.14"},{"version":"3.4.14","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105215","source_modified_at":"2026-10-05T13:28:36.853Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"zitadel","ecosystem":null},"version":"4.16.2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105215","source_modified_at":"2026-10-05T13:28:36.853Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"zitadel","ecosystem":null},"version":"3.4.14","basis":"first unaffected version stated in the CVE record"}],"cvss":9.3,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00339,"percentile":0.26167,"score_date":"2026-10-23"},"published_at":"2026-10-04T13:10:07.389Z","modified_at":"2026-10-05T13:28:36.853Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-105215","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-05T13:28:36.853Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-105215","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-738m-7888-jfv8","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/zitadel-before-4.16.2-account-pre-hijacking-via-forged-external-idp-callback","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":"2026-10-05T13:28:26.862481Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-05T13:28:36.853Z","content_hash":"534ba96f6c653e96b61fbc28402d61e968646bb2c07f02d9d8ba3136706fec7a"}}