What is CVE-2026-119127?

CVE-2026-119127 is a high-severity vulnerability in Zitadel, classified under Weak Password Recovery Mechanism for Forgotten Password. CVSS score: 8.1/10. Published 2026-10-29.

How severe is CVE-2026-119127?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Zitadel

CVE-2026-119127

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.

Published 2026-10-29 · last modified 2026-10-29.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Zitadel

Weakness classification (CWE)

CWE-640 — Weak Password Recovery Mechanism for Forgotten Password

References

github.com/zitadel/zitadel/security/advisories/GHSA-mchc-246r-6m76 (vendor-advisory)
www.vulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-account-takeover-via-l… (third-party-advisory)

Frequently asked questions

What is CVE-2026-119127?: CVE-2026-119127 is a high-severity vulnerability in Zitadel, classified under Weak Password Recovery Mechanism for Forgotten Password. CVSS score: 8.1/10. Published 2026-10-29.
How severe is CVE-2026-119127?: High severity. CVSS v3 base score is 8.1 out of 10.