{"id":"CVE-2026-85056","summary":"ZITADEL: MFA bypass via session reuse in Login V2","details":"ZITADEL is an open source identity management platform. From 4.0.0 until 4.16.1, ZITADEL Login V2 creates a browser session after password verification and can reuse that session for a later authentication request without verifying a user's enrolled TOTP, OTP, or U2F second factor. When the MFA step is abandoned and login starts again, session-validity checks require MFA only when the organization enables Force MFA or Force MFA for local users only, so a voluntarily enrolled factor can be skipped while completing an OIDC or SAML callback for a customer application. Login V1, the ZITADEL Console, Management and Admin APIs, and user self-management are not affected. This issue is fixed in version 4.16.1.","aliases":["GHSA-9993-rfwp-rhwf"],"modified":"2026-09-25T03:48:48.216369712Z","published":"2026-09-24T17:34:13.328Z","database_specific":{"cwe_ids":["CWE-287"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85056.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85056.json"},{"type":"FIX","url":"https://github.com/zitadel/zitadel/commit/049dbb25a56587fb3980c85c99819cad69f637db"},{"type":"FIX","url":"https://github.com/zitadel/zitadel/commit/56f4798ed31fc1cfcd9a0e7f6f0152289d2fdc43"},{"type":"WEB","url":"https://github.com/zitadel/zitadel/releases/tag/v4.16.1"},{"type":"ADVISORY","url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-9993-rfwp-rhwf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85056"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zitadel/zitadel","events":[{"introduced":"c86c60bab86b64b44755d2776703939c01686055"},{"fixed":"cc3812a940d629984802fd1246f84fd91d07f6e8"}],"database_specific":{"extracted_events":[{"introduced":"4.0.0"},{"fixed":"4.16.1"}],"source":"AFFECTED_FIELD"}}],"versions":["v4.12.3","v4.16.0","v4.15.3","v4.15.2","v4.15.1","v4.15.0","v4.14.0","v4.13.1","v4.13.0","v4.12.2","v4.12.1","v4.12.0","v4.11.1","v4.11.0","v4.10.1","v4.10.0","v4.9.2","v4.9.1","v4.9.0","v4.8.1","v4.8.0","v4.7.6","v4.7.5","v4.7.4","v4.7.3","v4.7.2","v4.7.1","v4.7.0","v4.6.6","v4.6.5","v4.6.4","v4.6.3","v4.6.2","v4.6.1","v4.6.0","v4.5.0","v4.4.0","v4.3.3","v4.3.2","v4.3.1","v4.3.0","v4.2.2","v4.2.1","v4.2.0","v4.1.4","v4.1.3","v4.1.2","v4.1.1","v4.1.0","v4.0.3","v4.0.2","v4.0.1","v4.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85056.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"}]}