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CVE-2026-119128 ZITADEL 4.0.0 before 4.19.5 Login V2 Account Takeover via Forgeable verificationCheck Cookie

CriticalCVSS 9.1 EPSS 0.29%
Published
Updated
Exploit status
No public exploit known
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Description

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 products

ProductAffected versionsFixed in
zitadel github.com/zitadel/zitadel >= 4.0.0, < 4.19.5 4.19.5

References