{"id":"CVE-2026-119127","state":"PUBLISHED","title":"ZITADEL 4.0.0 before 4.19.5 Account Takeover via Login V2 Host Header Injection","description":"ZITADEL 4.0.0 before 4.19.5 contains a host header injection vulnerability in the Login V2 UI that allows unauthenticated attackers to poison password-reset, invite, and email-verification links by supplying untrusted x-zitadel-public-host, x-zitadel-forward-host, or x-forwarded-host headers. Attackers knowing a victim's login name can point the links in genuine emails at their host, harvest the single-use codes when the links are opened, and take over accounts including instance administrators.","publishedAt":"2026-10-29T15:58:09.747Z","updatedAt":"2026-10-29T15:58:09.747Z","severity":{"score":8.6,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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-mchc-246r-6m76","https://www.vulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-account-takeover-via-login-v2-host-header-injection"],"weaknesses":["CWE-640"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/119xxx/CVE-2026-119127.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-119127","state":"PUBLISHED","datePublished":"2026-10-29T15:58:09.747Z","dateUpdated":"2026-10-29T15:58:09.747Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-29T14:25:14.746Z"},"containers":{"cna":{"title":"ZITADEL 4.0.0 before 4.19.5 Account Takeover via Login V2 Host Header Injection","descriptions":[{"lang":"en","value":"ZITADEL 4.0.0 before 4.19.5 contains a host header injection vulnerability in the Login V2 UI that allows unauthenticated attackers to poison password-reset, invite, and email-verification links by supplying untrusted x-zitadel-public-host, x-zitadel-forward-host, or x-forwarded-host headers. Attackers knowing a victim's login name can point the links in genuine emails at their host, harvest the single-use codes when the links are opened, and take over accounts including instance administrators."}],"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-mchc-246r-6m76","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-mchc-246r-6m76)"},{"url":"https://www.vulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-account-takeover-via-login-v2-host-header-injection","name":"VulnCheck Advisory: ZITADEL 4.0.0 before 4.19.5 Account Takeover via Login V2 Host Header Injection","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-640","lang":"en","description":"Weak Password Recovery Mechanism for Forgotten Password","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-29T15:58:09.747Z"},"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":"lucasdodgson","type":"reporter"},{"lang":"en","value":"livio-a","type":"remediation developer"},{"lang":"en","value":"wim07101993","type":"remediation reviewer"}],"x_generator":{"engine":"vulncheck-endgame"}}}}}