Multiple cross-site scripting (XSS) vulnerabilities in the JGS-XA JGS-Gallery Addon 4.0.0 and earlier for Woltlab Burning Board (wBB) 2.x allow remote attackers to inject arbitrary web script or HTML via the (1) userid parameter in (a) jgs_galerie_slideshow.php and (b) jgs_galerie_scroll.php, and the (2) katid parameter in (c) jgs_galerie_slideshow.php.