Multiple SQL injection vulnerabilities in Joels Bulletin board (JBB) 0.9.9rc3 and earlier allow remote attackers to execute arbitrary SQL commands via the (1) nr parameter in topiczeigen.php, (2) forum and (3) zeigeseite parameters in showforum.php, (4) forum parameter in newtopic.php, and (5) tidnr parameter in neuerbeitrag.php.