Cross-site scripting (XSS) vulnerability in MyBB before 1.6.5 allows remote attackers to inject arbitrary web script or HTML via vectors related to "usernames via AJAX."

Cross-site request forgery (CSRF) vulnerability in global.php in MyBB before 1.6.5 allows remote attackers to hijack the authentication of a user for requests that change the user's language via the language parameter.

Unspecified vulnerability in MyBB before 1.6.5 has unknown impact and attack vectors, related to an "unparsed user avatar in the buddy list."

DISPUTED Multiple SQL injection vulnerabilities in MyBB (aka MyBulletinBoard) before 1.6.1 allow remote attackers to execute arbitrary SQL commands via the keywords parameter in a (1) dosearch action to search.php or (2) dostuff action to private.php. NOTE: the vendor disputes this issue, saying "Although this doesn't lead to an SQL injection, it does provide a general MyBB SQL error."

Multiple SQL injection vulnerabilities in MyBB (aka MyBulletinBoard) before 1.6.7 allow remote administrators to execute arbitrary SQL commands via unspecified vectors in the (1) user search or (2) Mail Log in the Admin Control Panel (ACP).

MyBB (aka MyBulletinBoard) before 1.6.7 allows remote attackers to obtain sensitive information via a malformed forumread cookie, which reveals the installation path in an error message.