GHSA-25rw-g6ff-fmg8 CVE-2026-29193 GO-2026-4604
ZITADEL: Login V2 UI Policy Bypass Allows Unauthorized Self-Registration and Authentication
- Severity
- 8.2 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 0.33%
- Chance of exploitation in the next 30 days. Higher than 26.41% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-287 Improper Authentication
- Fix
- Available
- 2 packages have a fixed version
Description
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:
4.0.0through4.12.0(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.
Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| github.com/zitadel/zitadel | >= 4.0.0, < 4.12.1 |
4.12.1 |
| github.com/zitadel/zitadel | all versions |
No fix yet |
| github.com/zitadel/zitadel/v2 | >= 4.0.0, < 4.12.1 |
4.12.1 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
github.com/zitadel/zitadel Go → 4.12.1
- go
go get github.com/zitadel/zitadel@v4.12.1 && go mod tidy
github.com/zitadel/zitadel/v2 Go → 4.12.1
- go
go get github.com/zitadel/zitadel/v2@v4.12.1 && go mod tidy
Severity breakdown
CVSS 3.1 8.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- Low
- Availability
- None
Weakness
CWE-287: Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
How to prevent it
- Architecture and Design: Use an authentication framework or library such as the OWASP ESAPI Authentication feature.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-fgmf-7rf8-m6vf ZITADEL: Actions V1 sandbox escape: host file read via require() | High | Also affects github.com/zitadel/zitadel |
| GHSA-9993-rfwp-rhwf ZITADEL: MFA bypass via session reuse in Login V2 | High | Also affects github.com/zitadel/zitadel |
| GHSA-v859-c572-qh5p ZITADEL: Improper Role Revocation on Granted Projects during Multiple Role Deletions | Medium | Also affects github.com/zitadel/zitadel |
| GHSA-jq8w-8q2f-ffm9 ZITADEL Users Can Self-Verify Email/Phone via API | High | Also affects github.com/zitadel/zitadel |
| GHSA-vrh8-c9cm-wh8v ZITADEL: Unauthorized Token Privilege Escalation in OAuth2 Token Exchange | High | Also affects github.com/zitadel/zitadel |
| GHSA-992q-9gwp-7r79 ZITADEL: Auto-linking by email: IdP-side email verification is not checked | Medium | Also affects github.com/zitadel/zitadel |
| GHSA-v77h-2w3m-94hx ZITADEL: Missing Token Expiration (`exp`) Validation in JWT IdP Provider | Medium | Also affects github.com/zitadel/zitadel |
| GHSA-g5h5-m4hm-xjrr ZITADEL: Missing Token Audience Validation (`aud`) in JWT IdP Provider | Medium | Also affects github.com/zitadel/zitadel |
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