Authentication Bypass Vulnerability in ZITADEL Login V2 User Interface
CVE-2026-119128

9.1CRITICAL

Key Information:

Vendor

Zitadel

Status
Zitadel
Vendor
CVE Published:
29 October 2026

What is CVE-2026-119128?

An authentication bypass vulnerability exists in the Login V2 user interface of ZITADEL versions prior to 4.19.5. This flaw permits unauthenticated attackers to manipulate user credentials without needing any form of authentication. By generating a valid verificationCheck cookie derived from the user ID and browser fingerprint, attackers can set passwords, register passkeys, or link identity providers, thus enabling them to seize control of user accounts.

Affected Version(s)

zitadel 4.0.0 < 4.19.5

zitadel 4.19.5

References

https://github.com/zitadel/zitadel/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/zitadel-4.0.0-before...
third-party-advisory

CVSS V4

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

AdamKorcz
peintnermax
IAM-marco
livio-a
knQzx
.