CVE-2026-105215

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-105215", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-04T13:04:00.478Z", "datePublished": "2026-10-04T13:10:07.389Z", "dateUpdated": "2026-10-29T21:15:34.442Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-29T21:15:34.442Z"}, "datePublic": "2026-07-29T00:00:00.000Z", "title": "ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback", "descriptions": [{"lang": "en", "value": "ZITADEL before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 UI because the 'external account not found' registration endpoint trusts client-supplied external identity fields without a completed IdP callback. Unauthenticated attackers can submit forged IDPConfigID and ExternalUserID values to pre-create an account bound to a victim's external IdP identity, which the victim's later genuine external login then signs into."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Authentication Bypass by Spoofing", "cweId": "CWE-290", "type": "CWE"}]}], "affected": [{"vendor": "zitadel", "product": "zitadel", "defaultStatus": "unaffected", "versions": [{"version": "4.0.0", "status": "affected", "versionType": "semver", "lessThan": "4.16.2"}, {"version": "4.16.2", "status": "unaffected", "versionType": "semver"}]}, {"vendor": "zitadel", "product": "zitadel", "defaultStatus": "unaffected", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThan": "3.4.14"}, {"version": "3.4.14", "status": "unaffected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.16.2", "versionStartIncluding": "4.0.0"}]}]}, {"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.4.14"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 9.3, "baseSeverity": "CRITICAL"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL"}}], "references": [{"url": "https://github.com/zitadel/zitadel/security/advisories/GHSA-738m-7888-jfv8", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-738m-7888-jfv8)"}, {"name": "VulnCheck Advisory: ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/zitadel-before-4.16.2-account-pre-hijacking-via-forged-external-idp-callback"}], "credits": [{"lang": "en", "value": "Ibonok", "type": "reporter"}, {"lang": "en", "value": "livio-a", "type": "finder"}, {"lang": "en", "value": "IAM-marco", "type": "coordinator"}, {"lang": "en", "value": "AdamKorcz", "type": "reporter"}], "x_generator": {"engine": "vulncheck-endgame"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-05T13:28:26.862481Z", "id": "CVE-2026-105215", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-05T13:28:36.853Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-105215", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-05T13:28:26.862481Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-05T13:28:33.130Z"}}], "cna": {"title": "ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback", "credits": [{"lang": "en", "type": "reporter", "value": "Ibonok"}, {"lang": "en", "type": "finder", "value": "livio-a"}, {"lang": "en", "type": "coordinator", "value": "IAM-marco"}, {"lang": "en", "type": "reporter", "value": "AdamKorcz"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "baseScore": 9.3, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH"}}, {"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}], "affected": [{"vendor": "zitadel", "product": "zitadel", "versions": [{"status": "affected", "version": "4.0.0", "lessThan": "4.16.2", "versionType": "semver"}, {"status": "unaffected", "version": "4.16.2", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "zitadel", "product": "zitadel", "versions": [{"status": "affected", "version": "0", "lessThan": "3.4.14", "versionType": "semver"}, {"status": "unaffected", "version": "3.4.14", "versionType": "semver"}], "defaultStatus": "unaffected"}], "datePublic": "2026-07-29T00:00:00.000Z", "references": [{"url": "https://github.com/zitadel/zitadel/security/advisories/GHSA-738m-7888-jfv8", "name": "GitHub Security Advisory (GHSA-738m-7888-jfv8)", "tags": ["vendor-advisory"]}, {"url": "https://www.vulncheck.com/advisories/zitadel-before-4.16.2-account-pre-hijacking-via-forged-external-idp-callback", "name": "VulnCheck Advisory: ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback", "tags": ["third-party-advisory"]}], "x_generator": {"engine": "vulncheck-endgame"}, "descriptions": [{"lang": "en", "value": "ZITADEL before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 UI because the 'external account not found' registration endpoint trusts client-supplied external identity fields without a completed IdP callback. Unauthenticated attackers can submit forged IDPConfigID and ExternalUserID values to pre-create an account bound to a victim's external IdP identity, which the victim's later genuine external login then signs into."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-290", "description": "Authentication Bypass by Spoofing"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.16.2", "versionStartIncluding": "4.0.0"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "3.4.14"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-29T21:15:34.442Z"}}}, "cveMetadata": {"cveId": "CVE-2026-105215", "state": "PUBLISHED", "dateUpdated": "2026-10-29T21:15:34.442Z", "dateReserved": "2026-10-04T13:04:00.478Z", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "datePublished": "2026-10-04T13:10:07.389Z", "assignerShortName": "VulnCheck"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "zitadel", "vendor": "zitadel", "versions": [{"lessThan": "4.16.2", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"status": "unaffected", "version": "4.16.2", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "zitadel", "vendor": "zitadel", "versions": [{"lessThan": "3.4.14", "status": "affected", "version": "0", "versionType": "semver"}, {"status": "unaffected", "version": "3.4.14", "versionType": "semver"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "ZITADEL before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 UI because the 'external account not found' registration endpoint trusts client-supplied external identity fields without a completed IdP callback. Unauthenticated attackers can submit forged IDPConfigID and ExternalUserID values to pre-create an account bound to a victim's external IdP identity, which the victim's later genuine external login then signs into."}], "id": "CVE-2026-105215", "lastModified": "2026-10-29T21:17:10.043", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-105215", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-05T13:28:26.862481Z", "version": "2.0.3"}}]}, "published": "2026-10-04T15:16:32.993", "references": [{"source": "disclosure@vulncheck.com", "url": "https://github.com/zitadel/zitadel/security/advisories/GHSA-738m-7888-jfv8"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/zitadel-before-4.16.2-account-pre-hijacking-via-forged-external-idp-callback"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.16.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "4.16.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.4.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "3.4.14"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "zitadel", "vendor": "zitadel"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.16.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "4.16.2"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "zitadel", "source": "cna", "vendor": "zitadel"}, "product": "zitadel", "vendor": "zitadel"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.4.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "3.4.14"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "zitadel", "source": "cna", "vendor": "zitadel"}, "product": "zitadel", "vendor": "zitadel"}], "created": "2026-10-04T15:30:16.570761+00:00", "updated": "2026-10-04T15:45:04.852697+00:00", "vendors": ["zitadel", "zitadel$PRODUCT$zitadel"]}