SQL injection vulnerability in follow.php in Phorum 5.0.12 and earlier allows remote authenticated users to execute arbitrary SQL command via the forum_id parameter.
Multiple cross-site scripting (XSS) vulnerabilities in Phorum 3.1 through 5.0.3 beta allow remote attackers to inject arbitrary web script or HTML via the (1) HTTP_REFERER parameter to login.php, (2) HTTP_REFERER parameter to register.php, or (3) target parameter to profile.php.