The host is installed with Mozilla Firefox 4.x through 13.0, Firefox ESR 10.x before 10.0.6, Thunderbird 5.0 through 13.0, Thunderbird ESR 10.x before 10.0.6, or SeaMonkey before 2.11 and is prone to a cross site scripting vulnerability. A flaw is present in the applications, which fail to properly handle EMBED elements within description elements in RSS feeds. Successful exploitation could allow ...