{"cve":"CVE-2026-85056","nvd":{"published":"2026-09-24T18:19:04.040","modified":"2026-09-28T15:17:24.163","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2},"cwes":["CWE-287"],"references":["https://github.com/zitadel/zitadel/commit/049dbb25a56587fb3980c85c99819cad69f637db","https://github.com/zitadel/zitadel/commit/56f4798ed31fc1cfcd9a0e7f6f0152289d2fdc43","https://github.com/zitadel/zitadel/releases/tag/v4.16.1","https://github.com/zitadel/zitadel/security/advisories/GHSA-9993-rfwp-rhwf"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:02.509636177+00:00"},"epss":{"cve":"CVE-2026-85056","score":0.00285,"percentile":0.21103,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9993-rfwp-rhwf","url":"https://osv.dev/vulnerability/GHSA-9993-rfwp-rhwf","summary":"ZITADEL: MFA bypass via session reuse in Login V2","modified":"2026-10-01T20:56:14.075408631Z","packages":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","purl":"pkg:golang/github.com/zitadel/zitadel","ranges":["<1.80.0-v2.20.0.20260717062356-56f4798ed31f"],"fixed":["1.80.0-v2.20.0.20260717062356-56f4798ed31f"]}]},{"id":"GO-2026-6589","url":"https://osv.dev/vulnerability/GO-2026-6589","summary":"ZITADEL: MFA bypass via session reuse in Login V2 in github.com/zitadel/zitadel","modified":"2026-10-01T20:45:15.930385576Z","packages":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","purl":"pkg:golang/github.com/zitadel/zitadel","ranges":["<1.80.0-v2.20.0.20260717062356-56f4798ed31f"],"fixed":["1.80.0-v2.20.0.20260717062356-56f4798ed31f"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}