Multiple cross-site scripting (XSS) vulnerabilities in the com_listing component in Barter Sites component 1.3 for Joomla! allow remote authenticated users to inject arbitrary web script or HTML via the (1) listing_title (2) description (3) homeurl (aka Website Address) (4) paystring (aka Payment types accepted) (5) sell_price (6) shipping_cost and (7) quantity parameters to index.php.