SQL injection vulnerability in the init function in classsession.php in MyBB (aka MyBulletinBoard) 1.1.5 allows remote attackers to execute arbitrary SQL commands via the CLIENT-IP HTTP header ($SERVER['HTTPCLIENTIP'] variable), as utilized by index.php.
Cross-site scripting (XSS) vulnerability in archive/index.php/forum-4.html in MyBB (aka MyBulletinBoard) allows remote attackers to inject arbitrary web script or HTML via the navbits[][name] parameter.
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) doavatar action.
Cross-site scripting (XSS) vulnerability in usercp.php in MyBB (aka MyBulletinBoard) 1.x allows remote attackers to inject arbitrary web script or HTML via the gallery parameter.