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GHSA-jq8w-8q2f-ffm9
No affected components available
Summary
A vulnerability in Zitadel's self-management capability allowed users to mark their email and phone as verified without going through an actual verification process.
While GHSA-282g-fhmx-xf54 (CVE-2026-27946, "Users Can Self-Verify Email/Phone via UpdateHumanUser API") closed the path that let any authenticated user mark an arbitrary email or phone as verified on their own account by calling UpdateHumanUser with email.is_verified: true, additional paths were discovered.
Impact
Zitadel provides an API for managing users. The API also allows users to self-manage their own data including updating the email and phone.
Due to an improper permission check, the API allowed returning the verification code for the email and phone to the own user. This allows users to claim ownership of an email or phone they do not control and potentially bypass email-based security policies.
Note that when changing another user's email or phone, regardless of the verification flag, the permissions were correctly checked.
Affected Versions
Systems running one of the following versions are affected:
- 4.x:
4.0.0through4.15.0(including RC versions) - 3.x:
3.0.0through3.4.10(including RC versions) - 2.x:
2.43.0through2.71.19
Patches
The vulnerability has been addressed in the latest releases. The patch resolves the issue by requiring the correct permission in case the verification flag is provided and only allows self-management of the email address, resp. phone number itself.
4.x: Upgrade to >=4.15.1 3.x: Update to >=3.4.11 2.x: Update to >=3.4.11
Workarounds
The recommended solution is to upgrade to a patched version. If an upgrade is not possible, an action (v2) could be used to prevent returning the verification code to the own user.
Questions
If you have any questions or comments about this advisory, please email us at security@zitadel.com
Credits
Thanks to eddieran for reporting this vulnerability.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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