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GHSA-cjcp-qxvg-4rjm
No affected components available
Summary
A privilege escalation vulnerability exists in Grav’s Admin plugin due to the absence of username uniqueness validation when creating users. A user with the create user permission can create a new account using the same username as an existing administrator account, set a new password/email, and then log in as that administrator. This effectively allows privilege escalation from limited user-manager permissions to full administrator access.
Steps to Reproduce
- Make sure you have two accounts: an admin and a user with create user privilege
- In the user account, navigate to /grav-admin/admin/accounts/users and click "Add"
- Enter the name of the admin, complete registration and observe that the existing admin’s email is changed to the value you provided.
- Log out from user account log in as admin with new credentials
Impact
- Full admin takeover by any user with create user permission.
- Ability to change admin credentials, install/remove plugins, read or modify site data, and execute any action available to an admin.
- Severity: High/Critical.
PoC
https://github.com/user-attachments/assets/3ab0a7d6-5055-41be-9e0e-2bd6ca359b37
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 high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
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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