{"id":"CVE-2026-119127","title":"ZITADEL 4.0.0 before 4.19.5 Account Takeover via Login V2 Host Header Injection","summary":"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-ho…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","cvssSource":"cna","cwe":["CWE-640"],"vendor":"zitadel","product":"zitadel","affected":["zitadel >= 4.0.0 < 4.19.5"],"published":"2026-10-29","updated":"2026-10-29","sourceUpdated":"2026-10-29T15:58:09.747Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-119127","references":[{"url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-mchc-246r-6m76","label":"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","label":"VulnCheck Advisory: ZITADEL 4.0.0 before 4.19.5 Account Takeover via Login V2 Host Header Injection"}],"tags":["cve.org"],"epss":0.00278,"epssPercentile":0.20263,"ingestedAt":"2026-11-01T21:01:32.724Z","slug":"CVE-2026-119127","body":"## Overview\n\nZITADEL 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.\n\n## Affected\n\n- `zitadel >= 4.0.0 < 4.19.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}