The host is installed with Mozilla Firefox before 16.0.2, Firefox ESR 10.x before 10.0.10, Thunderbird before 16.0.2, Thunderbird ESR 10.x before 10.0.10 or SeaMonkey before 2.13.2 and is prone to cross-site scripting (XSS) vulnerabilities. The flaws are present in the applications, which fail to properly determine the calling document and principal in its return value. Successful exploitation allows remote attackers to execute arbitrary JavaScript code by leveraging certain add-on behavior.