{"id":"CVE-2026-105212","published":"2026-10-04T15:16:32.520","lastModified":"2026-10-05T15:17:19.203","description":"ZITADEL 3.x before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 and Login V2 UIs that accepts passkey or other authenticator enrollment on identify-only login sessions, before any primary factor is verified. Unauthenticated attackers knowing only a victim's login name can register an attacker-controlled authenticator and log in as that user, bypassing existing passwords and MFA.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwes":["CWE-287"],"vendors":[],"products":[],"references":[{"url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-45f2-5q3r-xgg6","tags":[]},{"url":"https://www.vulncheck.com/advisories/zitadel-before-3.4.14-and-4.16.2-account-takeover-via-passkey-enrollment","tags":[]}],"exploitRefs":[{"url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-45f2-5q3r-xgg6","tags":[]}],"hasPoc":true,"ai":{"summary":"ZITADEL's authentication system allows attackers to bypass primary factor verification by enrolling authenticators on identify-only login sessions, enabling unauthorized access using only a victim's username. This vulnerability affects both Login V1 and Login V2 UIs.","exploitability":"Exploitation is relatively straightforward requiring only knowledge of a victim's username, with no prerequisites beyond access to the affected login interfaces.","blast_radius":"The impact could be significant across all ZITADEL instances using affected versions, potentially allowing attackers to gain unauthorized access to user accounts without needing passwords or MFA tokens.","remediation":"Upgrade to ZITADEL 3.4.14 or 4.16.2 to remediate this authentication bypass vulnerability.","detection":"Monitor for authenticator enrollment events on identify-only login sessions in authentication logs, specifically looking for enrollment attempts that occur without prior password or MFA verification steps.","tags":["auth-bypass","authentication","login","identity"],"model":"garnet-coder","analyzedAt":"2026-10-12T08:57:25.196Z"}}