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GHSA-f4cf-9rvr-2rcx
No affected components available
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.1through4.7.1 - 3.x:
3.0.0-rc.1through3.4.4 - 2.x:
2.44.0through2.71.19
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.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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