{"id":"GO-2026-6589","revision":null,"records":[{"revision":"7883311b61074f74868887e7dc41134f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-85056","aliases":[],"title":"ZITADEL: MFA bypass via session reuse in Login V2","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.","state":0,"publishedAt":"2026-09-24T17:34:13.328+00:00","modifiedAt":"2026-09-28T14:56:04.082+00:00","affected":[{"ecosystem":"Vendor product","name":"zitadel","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"zitadel\",\n                    \"product\": \"zitadel\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 4.0.0, < 4.16.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 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,"severity":"HIGH"}],"references":["https://github.com/zitadel/zitadel/security/advisories/GHSA-9993-rfwp-rhwf","https://github.com/zitadel/zitadel/commit/049dbb25a56587fb3980c85c99819cad69f637db","https://github.com/zitadel/zitadel/commit/56f4798ed31fc1cfcd9a0e7f6f0152289d2fdc43","https://github.com/zitadel/zitadel/releases/tag/v4.16.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-85056","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-85056","identifiers":["CVE-2026-85056"]},"retained":false,"historicalAffected":[]},{"revision":"9959eb1a7db54b8a801ef25e87e31c8d","observedAt":"2026-11-11T17:01:42.05+00:00","statement":{"source":"euvd","id":"EUVD-2026-86324","aliases":["CVE-2026-85056","GHSA-9993-rfwp-rhwf"],"title":"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…","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 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,"severity":null}],"references":["https://github.com/zitadel/zitadel/security/advisories/GHSA-9993-rfwp-rhwf","https://github.com/zitadel/zitadel/commit/049dbb25a56587fb3980c85c99819cad69f637db","https://github.com/zitadel/zitadel/commit/56f4798ed31fc1cfcd9a0e7f6f0152289d2fdc43","https://github.com/zitadel/zitadel/releases/tag/v4.16.1"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-86324","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 24, 2026, 5:34:13 PM","dateUpdated":"Sep 28, 2026, 2:56:04 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-86324","identifiers":["EUVD-2026-86324","CVE-2026-85056","GHSA-9993-rfwp-rhwf"]},"retained":false,"historicalAffected":[]},{"revision":"781ed00bd47c417fb55760a71c969744","observedAt":"2026-10-25T16:19:16.24+00:00","statement":{"source":"nvd","id":"CVE-2026-85056","aliases":[],"title":"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…","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.","state":0,"publishedAt":"2026-09-24T18:19:04.04+00:00","modifiedAt":"2026-09-28T15:17:24.163+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2,"severity":"HIGH"}],"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"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-85056","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-287"],"productCriteria":[],"sourceDates":{"published":"2026-09-24T18:19:04.040","lastModified":"2026-09-28T15:17:24.163"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-85056","identifiers":["CVE-2026-85056"]},"retained":false,"historicalAffected":[]},{"revision":"0cdef74b0e72418fb489a2b28975302d","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-9993-rfwp-rhwf","aliases":["CVE-2026-85056","GO-2026-6589"],"title":"ZITADEL: MFA bypass via session reuse in Login V2","description":"### Summary\n\nA vulnerability in ZITADEL’s Login V2 UI allowed a password-verified browser session to be reused for a new authentication request without re-checking a user’s enrolled second factor (TOTP, OTP, or U2F). An attacker who already knows valid credentials can fully authenticate to an application without completing MFA.\n\n### Impact\n\nZITADEL Login V2 issues a session as soon as the user’s password is verified, before the MFA challenge is completed. If the MFA step is abandoned (for example by navigating back) and login is started again, Login V2 may reuse that existing session instead of requiring the second factor.\n\nSession validity checks only enforced MFA verification when the organization’s login policy had **Force MFA** (or **Force MFA for local users only**) enabled. They did not treat a voluntarily enrolled second factor as required. In the common case where MFA is available on the user but not organization-mandated, a password-only session was treated as fully authenticated and used to complete the OIDC or SAML callback, bypassing the user’s second factor.\n\n**Scope note:** This issue affects **customer applications** that authenticate users through the hosted **Login V2** UI (OIDC/SAML). It does **not** affect Login V1. It also does **not** affect authentication to ZITADEL itself — including the Console, the Management/Admin APIs, and user self-management — even when Login V2 is enabled.\n\n### Affected Versions\n\nSystems running one of the following versions are affected:\n\n* **4.x:** `4.0.0` through `4.16.0` (including RC versions)\n\n### Patches\n\nThe vulnerability has been addressed in the latest releases. The patch ensures Login V2 validates that any second factor enrolled on the user has been verified before an existing session can be reused to complete authentication.\n\n* **4.x**: Upgrade to $\\ge$ [4.16.1](https://github.com/zitadel/zitadel/releases/tag/v4.16.1)\n\n### Workarounds\n\nIf an immediate upgrade is not possible, enable **Force MFA** (or **Force MFA for local users only**, if you want to exempt IdP/federated logins) in the affected organization’s — or the instance default — login policy. This makes second-factor verification mandatory for password logins and closes this session-reuse bypass.\n\nNote that this is a broader policy change (MFA becomes mandatory for the scoped local logins) rather than a narrow fix limited to users who already self-enrolled a second factor.\n\n### Questions\n\nIf you have any questions or comments about this advisory, please email us at [security@zitadel.com](mailto:security@zitadel.com)\n\n### Credits\n\nThanks to Philippe Wechsler ([@MadMonkey87](https://github.com/MadMonkey87)) for finding and reporting the vulnerability.","state":0,"publishedAt":"2026-09-24T18:19:35+00:00","modifiedAt":"2026-10-01T20:56:14.0754086+00:00","affected":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.80.0-v2.20.0.20260717062356-56f4798ed31f"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/zitadel/zitadel/security/advisories/GHSA-9993-rfwp-rhwf","https://github.com/zitadel/zitadel/commit/049dbb25a56587fb3980c85c99819cad69f637db","https://github.com/zitadel/zitadel/commit/56f4798ed31fc1cfcd9a0e7f6f0152289d2fdc43","https://github.com/zitadel/zitadel","https://github.com/zitadel/zitadel/releases/tag/v4.16.1"],"sourceUrl":"https://github.com/advisories/GHSA-9993-rfwp-rhwf","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-9993-rfwp-rhwf","identifiers":["GHSA-9993-rfwp-rhwf","CVE-2026-85056","GO-2026-6589"]},"retained":false,"historicalAffected":[]},{"revision":"0910fd9199ec49d3b68668517c22b829","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6589","aliases":["CVE-2026-85056","GHSA-9993-rfwp-rhwf"],"title":"ZITADEL: MFA bypass via session reuse in Login V2 in github.com/zitadel/zitadel","description":"ZITADEL: MFA bypass via session reuse in Login V2 in github.com/zitadel/zitadel","state":0,"publishedAt":"2026-10-01T20:23:38+00:00","modifiedAt":"2026-10-01T20:45:15.9303856+00:00","affected":[{"ecosystem":"Go","name":"github.com/zitadel/zitadel","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.80.0-v2.20.0.20260717062356-56f4798ed31f"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/zitadel/zitadel/security/advisories/GHSA-9993-rfwp-rhwf","https://github.com/zitadel/zitadel/commit/049dbb25a56587fb3980c85c99819cad69f637db","https://github.com/zitadel/zitadel/commit/56f4798ed31fc1cfcd9a0e7f6f0152289d2fdc43","https://github.com/zitadel/zitadel/releases/tag/v4.16.1"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6589","license":"OSV · upstream source license applies","key":"osv:GO-2026-6589","identifiers":["GO-2026-6589","CVE-2026-85056","GHSA-9993-rfwp-rhwf"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-11T20:58:42.4460032+00:00","complete":true,"records":1779,"lastAttemptAt":"2026-11-11T20:58:42.4460032+00:00","lastSuccessAt":"2026-11-11T20:58:42.6009016+00:00","error":null,"lastVerifiedAt":"2026-11-11T20:58:42.6009024+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-de3b77103708811b6494d2ff7c979037d73ae579742cd1649a5c765137ae5083-bc2564cf749a574ebe6216cd53b2772c98ccf01e107d9e465c7cb9637c59db40","complete":true,"records":424281,"lastAttemptAt":"2026-11-11T20:56:40.1262638+00:00","lastSuccessAt":"2026-11-11T19:56:47.8167322+00:00","error":null,"lastVerifiedAt":"2026-11-11T20:56:40.1262638+00:00","snapshotPublishedAt":"2026-11-11T19:18:45+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-cbeeeca22e4a4c188e95cc4f8cfc6560","complete":false,"records":13759,"lastAttemptAt":"2026-11-11T21:08:58.0161049+00:00","lastSuccessAt":"2026-11-11T21:08:58.011+00:00","error":"249 identifier lookups failed; latest failures include AccessDenied (HTTP 403). Other identifiers were checked independently.","lastVerifiedAt":"2026-11-11T21:08:58.011+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13368,"expectedIdentifiers":13813,"failedIdentifiers":249},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-11T20:58:42.4460032+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-11T20:58:42.4460032+00:00","lastSuccessAt":"2026-11-11T20:58:42.6018487+00:00","error":null,"lastVerifiedAt":"2026-11-11T20:58:42.6018491+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-f58072f00ed84b8dbc554f4a4e66e21a","complete":true,"records":13753,"lastAttemptAt":"2026-11-11T20:59:01.4643428+00:00","lastSuccessAt":"2026-11-11T20:59:01.459+00:00","error":null,"lastVerifiedAt":"2026-11-11T20:59:01.459+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13813,"expectedIdentifiers":13813,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-3562b6c78fd1bd0f0b55daf66a0926ae24f65e462df7f6d928caad458fc696bf","complete":true,"records":9947,"lastAttemptAt":"2026-11-11T20:58:42.3041045+00:00","lastSuccessAt":"2026-11-11T04:27:43.6877707+00:00","error":null,"lastVerifiedAt":"2026-11-11T20:58:42.3041045+00:00","snapshotPublishedAt":"2026-11-11T03:32:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-456002455e0ab94bb92c95476d4e6d175c104cd594749982afd96c893728ecbc","complete":true,"records":2010,"lastAttemptAt":"2026-11-11T20:56:40.2809572+00:00","lastSuccessAt":"2026-11-11T02:36:58.1276999+00:00","error":null,"lastVerifiedAt":"2026-11-11T20:56:40.2809572+00:00","snapshotPublishedAt":"2026-11-11T01:17:51+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-baa8362b4daf9e5f39d5563775a55935e7b442c0735d33274a921579ce4a0d66","complete":true,"records":3093,"lastAttemptAt":"2026-11-11T20:58:42.411286+00:00","lastSuccessAt":"2026-11-11T13:00:02.5446881+00:00","error":null,"lastVerifiedAt":"2026-11-11T20:58:42.411286+00:00","snapshotPublishedAt":"2026-11-11T12:47:47+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-757d3692f9a7b34792dad960197f3cc953a54db59b7d0ffe3835a0ed9926f76b","complete":true,"records":231690,"lastAttemptAt":"2026-11-11T20:58:42.1683586+00:00","lastSuccessAt":"2026-11-11T20:58:40.6131056+00:00","error":null,"lastVerifiedAt":"2026-11-11T20:58:42.1683586+00:00","snapshotPublishedAt":"2026-11-11T20:03:03+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}