Cross-site scripting (XSS) vulnerability in index.php in Yet another Bulletin Board (YaBB) allows remote attackers to inject arbitrary web script or HTML via the categories parameter.
Multiple SQL injection vulnerabilities in YaBB SE 1.5.4 through 1.5.5b allow remote attackers to execute arbitrary SQL via (1) the msg parameter in ModifyMessage.php or (2) the postid parameter in ModifyMessage.php.
Directory traversal vulnerability in ModifyMessage.php in YaBB SE 1.5.4 through 1.5.5b allows remote attackers to delete arbitrary files via a .. (dot dot) in the attachOld parameter.