What is CVE-2026-119128?

CVE-2026-119128 is a high-severity vulnerability in Zitadel, classified under Reliance on Cookies without Validation and Integrity Checking. CVSS score: 7.4/10. Published 2026-10-29.

How severe is CVE-2026-119128?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Zitadel

CVE-2026-119128

ZITADEL 4.0.0 before 4.19.5 contains an authentication bypass vulnerability in the Login V2 UI that allows unauthenticated attackers to set the first credential of users lacking any authentication method. Attackers can compute a valid verificationCheck cookie from the user ID and browser fingerprint to set a password, register a passkey, or link an identity provider, taking over the account.

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

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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-565 — Reliance on Cookies without Validation and Integrity Checking

References

github.com/zitadel/zitadel/security/advisories/GHSA-84fg-x5h4-w8xv (vendor-advisory)
www.vulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-login-v2-account-takeo… (third-party-advisory)

Frequently asked questions

What is CVE-2026-119128?: CVE-2026-119128 is a high-severity vulnerability in Zitadel, classified under Reliance on Cookies without Validation and Integrity Checking. CVSS score: 7.4/10. Published 2026-10-29.
How severe is CVE-2026-119128?: High severity. CVSS v3 base score is 7.4 out of 10.