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.
Cross-site scripting (XSS) vulnerability in attachment.php in MyBulletinBoard (MyBB) 1.1.7 and possibly other versions allows remote attackers to inject arbitrary web script or HTML via a GIF image that contains URL-encoded Javascript, which is rendered by Internet Explorer.
Cross-site scripting (XSS) vulnerability in newthread.php in MyBB (aka MyBulletinBoard) 1.10, when configured to permit new threads by unregistered users, allows remote attackers to inject arbitrary web script or HTML via the username.