{"affected":[{"defaultStatus":"unaffected","product":"zitadel","source":"CNA: VulnCheck","vendor":"zitadel","versions":[{"lessThan":"4.19.5","status":"affected","version":"4.0.0","versionType":"semver"},{"status":"unaffected","version":"4.19.5","versionType":"semver"}]}],"cveId":"CVE-2026-119127","cwes":["CWE-640"],"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.","epss":{"date":"2026-11-03","percentile":0.20299,"score":0.00278},"exploits":[],"kev":null,"metrics":[{"score":8.6,"severity":"high","source":"CNA: VulnCheck","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","version":"4.0"},{"score":8.1,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","version":"3.1"}],"modifiedAt":1793755518265,"publishedAt":1793289489747,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-mchc-246r-6m76"},{"source":"CNA: VulnCheck","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"}],"remediation":[],"revision":"2c2c8155168188ae65aa54e4e6c88a107173e1dc07ded484a72a20136a378e33","sources":[{"modifiedAt":1793755518265,"name":"CNA: VulnCheck","retrievedAt":1793758132904,"url":"https://www.cve.org/CVERecord?id=CVE-2026-119127"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793758141204,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-119127"}],"ssvc":{"assessedAt":1793755504825,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"ZITADEL 4.0.0 before 4.19.5 Account Takeover via Login V2 Host Header Injection","updatedAt":1793758141204}