CVE-2024-37899: XWiki Platform allows remote code execution from user account

When an admin disables a user account, the user’s profile is executed with the admin’s rights. This allows a user to place malicious code in the user profile before getting an admin to disable the user account.

To reproduce, as a user without script nor programming rights, edit the about section of your user profile and add {{groovy}}services.logging.getLogger("attacker").error("Hello from Groovy!"){{/groovy}}. As an admin, go to the user profile and click the “Disable this account” button. Then, reload the page. If the logs show attacker - Hello from Groovy! then the instance is vulnerable.