On en.wikipedia, a user with the "eventcoordinator" right should be able to modify other users' rights (to add the "confirmed" right).

However, accessing Special:UserRights from a non-administrator account with the "eventcoordinator" right displays the "View user groups" prompt with no user right controls (which is the default behavior for users without the "eventcoordinator" right) rather than the "Edit user groups" prompt and user right controls.

Steps to reproduce:

1. Create a new account.
2. Assign the "eventcoordinator" user right to the new account.
3. Log in as the new account.
4. Go to Special:UserRights.
5. Enter a user account name in the "Select a user" text box and click "Load user groups".