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.
SQL injection vulnerability in profile.php in YaBB SE 1.5.5 and earlier allows remote attackers to execute SQL commands via a double-encoded user parameter in a viewprofile action.
SSI.php in YaBB SE 1.5.2 allows remote attackers to execute arbitrary PHP code by modifying the sourcedir parameter to reference a URL on a remote web server that contains the code.