{"id":"CVE-2026-105211","aliases":["GHSA-3gwm-5wx8-4gm6"],"url":"https://o3.security/vulnerability/CVE-2026-105211","summary":"ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode","details":"ZITADEL before 4.17.1 contains an authentication bypass vulnerability in Login V2 that allows unauthenticated attackers to take over accounts by obtaining OTP codes via the returnCode delivery type. Attackers knowing a login name of a victim with OTP-Email and OTP-SMS enrolled can read both codes from server-action responses to gain MFA-authenticated sessions, including administrator takeover.","published":"2026-10-04T13:10:04.626Z","modified":"2026-10-07T02:30:40.117484854Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105211.json"},{"type":"ADVISORY","url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-3gwm-5wx8-4gm6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105211"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/zitadel-before-4.17.1-authentication-bypass-via-login-v2-otp-returncode"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-07T02:30:40.117484854Z"}}