Cross-site scripting (XSS) vulnerability in index.php in Simple Machines Forum (SMF) allows remote attackers to inject arbitrary web script or HTML via a base64 encoded params value in the action parameter.
Multiple cross-site scripting (XSS) vulnerabilities in index.php in Simple Machines Forum (SMF) 1.1 RC3 allow remote authenticated users to inject arbitrary web script or HTML via the (1) recipient or (2) BCC field when selecting send in a pm action.