When I visit my forums directories, all files are shown that are in the folder, how do I hide that?
It's a security issue and opens up more issues in regards to theme ripping etc.
How do I fix it?
EDIT: Just changed file permissions.
Default MyBB directories have a blank index.html file to stop that from happening.
Just upload a blank index file, or a redirect index file so that it also send them back.
there's also an option in .htaccess (or your webserver config) to disable listing directory contents
it's a good idea to disable this globally and enable it only for the directories where you actually want the contents listed
some servers even suggest similar item names in addition to the indexes, which completely breaks your back when you rely on not guessable filenames (like the MyBB backups)