Multiple cross-site scripting (XSS) vulnerabilities in the RSS module in PostNuke 0.750 and 0.760RC2 and RC3 allow remote attackers to inject arbitrary web script or HTML via the (1) rss_url parameter to magpie_slashbox.php, or the url parameter to (2) magpie_simple.php or (3) magpie_debug.php.
http://news.postnuke.com/modules.php?op=modload&name=News&file=article&sid=2691