MyBB (aka MyBulletinBoard) allows remote attackers to obtain sensitive information via a direct request for inc/plugins/hello.php, which reveals the path in an error message.
Directory traversal vulnerability in usercp.php in MyBB (aka MyBulletinBoard) 1.x allows remote attackers to read arbitrary files via a .. (dot dot) in the gallery parameter in a (1) avatar or (2) do_avatar action.
polls.php in MyBB (aka MyBulletinBoard) 1.10 allows remote attackers to obtain sensitive information via a vote action with an "option[]=null" parameter value, which reveals the path in an error message.