{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-105211", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-04T13:02:21.188Z", "datePublished": "2026-10-04T13:10:04.626Z", "dateUpdated": "2026-10-04T13:10:04.626Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-04T13:10:04.626Z"}, "datePublic": "2026-08-14T00:00:00.000Z", "title": "ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Exposure of Sensitive Information to an Unauthorized Actor", "cweId": "CWE-200", "type": "CWE"}]}], "affected": [{"vendor": "zitadel", "product": "zitadel", "defaultStatus": "unaffected", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThan": "4.17.1"}, {"version": "4.17.1", "status": "unaffected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.17.1"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 9.2, "baseSeverity": "CRITICAL"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH"}}], "references": [{"url": "https://github.com/zitadel/zitadel/security/advisories/GHSA-3gwm-5wx8-4gm6", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-3gwm-5wx8-4gm6)"}, {"name": "VulnCheck Advisory: ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/zitadel-before-4.17.1-authentication-bypass-via-login-v2-otp-returncode"}], "credits": [{"lang": "en", "value": "IAM-marco", "type": "finder"}, {"lang": "en", "value": "livio-a", "type": "finder"}, {"lang": "en", "value": "lucasdodgson", "type": "reporter"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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{}

{"created": "2026-10-04T15:30:16.572180+00:00", "updated": "2026-10-04T15:30:16.572186+00:00", "vendors": []}