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.
search.php in MyBB 1.0.2 allows remote attackers to obtain sensitive information via a certain search request that reveals the table prefix in a SQL error message, possibly due to invalid parameters.