{"id":"CVE-2026-119128","state":"PUBLISHED","title":"ZITADEL 4.0.0 before 4.19.5 Login V2 Account Takeover via Forgeable verificationCheck Cookie","description":"ZITADEL 4.0.0 before 4.19.5 contains an authentication bypass vulnerability in the Login V2 UI that allows unauthenticated attackers to set the first credential of users lacking any authentication method. Attackers can compute a valid verificationCheck cookie from the user ID and browser fingerprint to set a password, register a passkey, or link an identity provider, taking over the account.","publishedAt":"2026-10-29T15:58:10.483Z","updatedAt":"2026-10-29T15:58:10.483Z","severity":{"score":9.1,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["zitadel zitadel"],"affected":[{"vendor":"zitadel","product":"zitadel","defaultStatus":"unaffected","versions":[{"version":"4.0.0","status":"affected","lessThan":"4.19.5","versionType":"semver"},{"version":"4.19.5","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/zitadel/zitadel/security/advisories/GHSA-84fg-x5h4-w8xv","https://www.vulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-login-v2-account-takeover-via-forgeable-verificationcheck-cookie"],"weaknesses":["CWE-565"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/119xxx/CVE-2026-119128.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-119128","state":"PUBLISHED","datePublished":"2026-10-29T15:58:10.483Z","dateUpdated":"2026-10-29T15:58:10.483Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-29T14:26:15.521Z"},"containers":{"cna":{"title":"ZITADEL 4.0.0 before 4.19.5 Login V2 Account Takeover via Forgeable verificationCheck Cookie","descriptions":[{"lang":"en","value":"ZITADEL 4.0.0 before 4.19.5 contains an authentication bypass vulnerability in the Login V2 UI that allows unauthenticated attackers to set the first credential of users lacking any authentication method. Attackers can compute a valid verificationCheck cookie from the user ID and browser fingerprint to set a password, register a passkey, or link an identity provider, taking over the account."}],"affected":[{"vendor":"zitadel","product":"zitadel","defaultStatus":"unaffected","versions":[{"version":"4.0.0","status":"affected","lessThan":"4.19.5","versionType":"semver"},{"version":"4.19.5","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-84fg-x5h4-w8xv","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-84fg-x5h4-w8xv)"},{"url":"https://www.vulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-login-v2-account-takeover-via-forgeable-verificationcheck-cookie","name":"VulnCheck Advisory: ZITADEL 4.0.0 before 4.19.5 Login V2 Account Takeover via Forgeable verificationCheck Cookie","tags":["third-party-advisory"]}],"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:N/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":9.1,"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:N","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-565","lang":"en","description":"Reliance on Cookies without Validation and Integrity Checking","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-29T15:58:10.483Z"},"datePublic":"2026-10-15T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*","versionEndExcluding":"4.19.5","versionStartIncluding":"4.0.0"}]}]}],"credits":[{"lang":"en","value":"AdamKorcz","type":"reporter"},{"lang":"en","value":"peintnermax","type":"remediation developer"},{"lang":"en","value":"IAM-marco","type":"remediation reviewer"},{"lang":"en","value":"livio-a","type":"remediation reviewer"},{"lang":"en","value":"knQzx","type":"other"}],"x_generator":{"engine":"vulncheck-endgame"}}}}}