[Seven Skins]

adminCP > Plugins & Products > Add New Plugin

Then

Product - vbulletin
hook location - memberlist_start
title - Show Memberslist only to Admins and Moderators
Execution Order - 5
Plugin PHP Code :

if (!is_member_of($vbulletin->userinfo, 5, 6, 7))
{
    print_no_permission();
}

Active - yes

Hit save.


Only admin and mods will see the memberlist.php ..other will get no permission error.