Open redirect vulnerability in go.php in vBulletin 4.2.1 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a URL in the url parameter.
SQL injection vulnerability in includes/api/4/breadcrumbs_create.php in vBulletin 4.2.2, 4.2.1, 4.2.0 PL2, and earlier allows remote authenticated users to execute arbitrary SQL commands via the conceptid argument in an xmlrpc API request.