{"id":"CVE-2026-105207","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-105207","summary":"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,…","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.","published":"2026-10-04T15:16:31.677","modified":"2026-10-04T15:16:31.793","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-g8gj-gq47-xgf4"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/zitadel-before-4.17.3-account-takeover-via-external-idp-linking"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-10-04T15:16:31.793"}}