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 do_search action, which is not properly handled in a forced SQL error message.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.