Question

I would like to allow the logged user to edit MediaWiki/Common.css without adding them to the sysop group.

I understand that this will allow user to change it to harful ways but it is a closed wiki so that is not a problem.

Any solution is acceptable even changing php code 🙂

Answer 1

Create a new group, add give it ‘editinterface’ privilege. In LocalSettings.php it’s done like this:

$wgGroupPermissions['mynewgroup']['editinterface'] = true; 

Then add the user to you new group.

Or if you want to give that right to all logged-in users, do it like this:

$wgGroupPermissions['user']['editinterface'] = true; // user is the default group for all logged-in users 

For details see MediaWiki manual.