CVE-2025-67717: Zitadel Discloses the Total Number of Instance Users
Summary
Zitadel's User Service discloses the total number of instance users to unauthorized users.
Impact
The ZITADEL User Service exposes the total number of users within an instance to any authenticated user, regardless of their specific permissions. While this does not leak individual user data or PII, disclosing the total user count via the totalResult field constitutes an information disclosure vulnerability that may be sensitive in certain contexts.
Affected Versions
Systems running one of the following version are affected:
- 4.x: 4.0.0-rc.1 through 4.7.1 - 3.x: 3.0.0-rc.1 through 3.4.4 - 2.x: 2.44.0 through 2.71.19
Patches
The vulnerability has been addressed in the latest release. The patch resolves the issue and returns the totalResult value corresponding to the number of instance users for whom the querying user has read permission.
- 4.x: Upgrade to >= 4.7.2 - 3.x: Update to >= 3.4.5 - 2.x: Update to >= 3.4.5 (or checkout the workarounds section)
Workarounds
The recommended solution is to update Zitadel to a patched version.
If a version upgrade is not possible, you can enable the permissionCheckV2 feature on your instance.
Questions
If you have any questions or comments about this advisory, please email us at security@zitadel.com
Credits
This vulnerability was found by zentrust partners GmbH during a scheduled penetration test. Thank you to the analysts Martin Tschirsich, Joud Zakharia, Christopher Baumann. The full report will be made public after the complete review.
Other sources
ZITADEL is an open-source identity infrastructure tool. Versions 2.44.0 through 3.4.4 and 4.0.0-rc.1 through 4.7.1 disclose the total number of instance users to authenticated users, regardless of their specific permissions. While this does not leak individual user data or PII, disclosing the total user count via the totalResult field constitutes an information disclosure vulnerability that may be sensitive in certain contexts. This issue is fixed in versions 3.4.5 and 4.7.2.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-67717?
CVE-2025-67717 has been classified with a moderate severity due to the unauthorized disclosure of user information.
How do I fix CVE-2025-67717?
To resolve CVE-2025-67717, update the Zitadel User Service to versions 1.80.0-v2.20.0.20251210121356-826039c6208f, 3.4.5, or 4.7.2.
Who is affected by CVE-2025-67717?
Any user of the Zitadel User Service who has authentication rights is potentially affected by CVE-2025-67717.
What information is exposed in CVE-2025-67717?
CVE-2025-67717 allows unauthorized users to view the total number of instance users within Zitadel.
Is there a workaround for CVE-2025-67717?
There are no known workarounds for CVE-2025-67717; the recommended action is to update to the fixed versions.