Paper/Archive/CVE-2026-119128

CVE-2026-119128

zitadel zitadel — ZITADEL 4.0.0 before 4.19.5 Login V2 Account Takeover via Forgeable verificationCheck Cookie

CVSS 9.1 (CNA)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 No EPSS score.000 × 200.0 No public exploit+100.0 SSVC exploitation: unknown+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

zitadel4.0.0 – < 4.19.54.19.5CNA

Scores by source

VulnCheck (CNA)9.1CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

VulnCheck (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

advisorygithub.com/zitadel/zitadel/security/advisories/GHSA-84fg-x5h4-w8xv writeupvulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-login-v2-account-takeover-via-forgeable-verificationcheck-cookie