Login Request a demo
High severity · published Oct 29, 2026
CVE-2026-119128
ZITADEL 4.0.0 before 4.19.5 Login V2 Account Takeover via Forgeable verificationCheck Cookie
New
7.4
CVSS
–
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZI
zitadel · zitadel
4.0.0 before 4.19.5 · source: vendor
Affected product
ZI
zitadel
zitadel
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-119128
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-119128
vendor-advisory
https://github.com/zitadel/zitadel/security/advisories/GHSA-84fg-x5h4-w8xv
third-party-advisory
https://www.vulncheck.com/advisories/zitadel-4.0.0-before-4.19.5-login-v2-account-takeover-via-forgeable-verificationcheck-cookie
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