{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-119127","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-10-29T14:25:14.746Z","datePublished":"2026-10-29T15:58:09.747Z","dateUpdated":"2026-10-29T15:58:09.747Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-10-29T15:58:09.747Z"},"datePublic":"2026-10-15T00:00:00.000Z","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."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Weak Password Recovery Mechanism for Forgotten Password","cweId":"CWE-640","type":"CWE"}]}],"affected":[{"vendor":"zitadel","product":"zitadel","defaultStatus":"unaffected","versions":[{"version":"4.0.0","status":"affected","versionType":"semver","lessThan":"4.19.5"},{"version":"4.19.5","status":"unaffected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*","versionEndExcluding":"4.19.5","versionStartIncluding":"4.0.0"}]}]}],"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"}}],"references":[{"url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-mchc-246r-6m76","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-mchc-246r-6m76)"},{"name":"VulnCheck Advisory: ZITADEL 4.0.0 before 4.19.5 Account Takeover via Login V2 Host Header Injection","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-account-takeover-via-login-v2-host-header-injection"}],"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"}}}}