Multiple cross-site scripting (XSS) vulnerabilities in Extreme Messageboard (XMB) 1.8 SP3 and 1.9 beta allow remote attackers to inject arbitrary web script or HTML via the (1) xmbuser parameter to xmb.php, (2) folder parameter to u2u.php, (3) viewmost, replymost, or latest parameter to stats.php, (4) message or icons parameter to post.php, (5) threadlist, pagelinks, forumlist, navigation, or (6) forumdisplay parameter to forumdisplay.php.