{"id":"CVE-2026-119127","published":"2026-10-29T16:18:05.487","lastModified":"2026-10-29T16:18:05.603","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.","cvssScore":8.1,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","cwes":["CWE-640"],"vendors":[],"products":[],"references":[{"url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-mchc-246r-6m76","tags":[]},{"url":"https://www.vulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-account-takeover-via-login-v2-host-header-injection","tags":[]}],"exploitRefs":[{"url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-mchc-246r-6m76","tags":[]}],"hasPoc":true,"ai":null}