CVE-2026-119128

High

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.

SeverityHigh

CVSS7.4

Exploit probability—

ProductZitadel

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-565CWE-565

How to fix

Update

zitadel zitadel4.19.5 or later

Vendor advisories

github.com/zitadel/zitadel/security/advisories/GHSA-84fg-x5h4-w8xv

Affected products

Product	Affected versions	Fixed in
zitadel zitadel	4.0.0 ≤ v < 4.19.5	4.19.5

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