Cross-site scripting (XSS) vulnerability in Upload/search.php in MyBB 1.6.12 and earlier allows remote attackers to inject arbitrary web script or HTML via the keywords parameter in a dosearch action, which is not properly handled in a forced SQL error message.

Cross-site scripting (XSS) vulnerability in the mycodeparsevideo function in inc/classparser.php in MyBB (aka MyBulletinBoard) before 1.6.12 allows remote attackers to inject arbitrary web script or HTML via vectors related to Yahoo video URLs.

Cross-site scripting (XSS) vulnerability in misc.php in MyBB (aka MyBulletinBoard) before 1.6.12 allows remote attackers to inject arbitrary web script or HTML via the editor parameter in a smilie list popup.

myBB version 1.6.4 was distributed with an unauthorized backdoor embedded in the source code. The backdoor allowed remote attackers to execute arbitrary PHP code by injecting payloads into a specially crafted collapsed cookie. This vulnerability was introduced during packaging and was not part of the intended application logic. Exploitation requires no authentication and results in full compromise of the web server under the context of the web application.

SQL injection vulnerability in the User Inline Moderation feature in the Admin Control Panel (ACP) in MyBB (aka MyBulletinBoard) before 1.6.7 allows remote administrators to execute arbitrary SQL commands via unspecified vectors.

Cross-site scripting (XSS) vulnerability in the Admin Control Panel (ACP) in MyBB (aka MyBulletinBoard) before 1.6.7 allows remote administrators to inject arbitrary web script or HTML via a malformed file name in an orphaned attachment.