The host is installed with Mozilla Firefox before 42.0 or Firefox ESR 38.x before 38.4 and is prone to a same origin policy bypass vulnerability. A flaw is present in the applications, which fail to properly follow the CORS cross-origin request algorithm for the POST method in situations involving an unspecified Content-Type header manipulation. Successful exploitation could allow attackers to bypass the Same Origin Policy by leveraging the lack of a preflight-request step.