CVE-2026-29193: ZITADEL: Bypassing Zitadel Login Behavior and Security Policy in Login V2
Summary
A vulnerability in Zitadel's login V2 UI allowed users to bypass login behavior and security policies and self-register new accounts or sign in using password even if corresponding options were disabled in their organizaton.
Impact
Zitadel enables administrators to configure their organization’s login behavior and security policies. As part of this functionality, they can disable user self-registration, enforce passwordless logins only, and more.
Due to improper enforcement an attacker could send direct HTTP requests to the login UI and create accounts in organizations that have disabled user self-registration, and gain unauthorized access to the system. The same attack vector could be used to authenticate for example using username and password even when this login method was disabled.
Affected Versions
Systems running one of the following versions are affected: - 4.x: 4.0.0 through 4.12.0 (including RC versions)
Patches
The vulnerability has been addressed in the latest releases. The patch resolves the issue by enforcing the policies on the logiin UI server.
4.x: Upgrade to >=4.12.1
Workarounds
The recommended solution is to upgrade to a patched version.
Questions
If there are any questions or comments about this advisory, please send an email to security@zitadel.com
Credits
ZITADEL extends thanks once again to Amit Laish from GE Vernova for finding and reporting the vulnerability.
Other sources
ZITADEL is an open source identity management platform. From version 4.0.0 to 4.12.0, a vulnerability in Zitadel's login V2 UI allowed users to bypass login behavior and security policies and self-register new accounts or sign in using password even if corresponding options were disabled in their organizaton. This issue has been patched in version 4.12.1.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-29193?
CVE-2026-29193 is considered a critical vulnerability due to its potential to allow unauthorized account registration and login.
How do I fix CVE-2026-29193?
To fix CVE-2026-29193, update Zitadel to version 4.12.1 or later, which addresses this vulnerability.
What impact does CVE-2026-29193 have on user accounts?
CVE-2026-29193 allows users to bypass security policies, enabling unauthorized self-registration and login despite restrictions set by administrators.
Which versions of Zitadel are affected by CVE-2026-29193?
CVE-2026-29193 affects Zitadel versions from 4.0.0 to 4.12.0.
Is there a workaround for CVE-2026-29193 until I can update?
There are no known workarounds for CVE-2026-29193, so updating to the fixed version is strongly recommended.