Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 do not impose certain ECMAScript 6 requirements on JavaScript object properties, which allows remote attackers to bypass the Same Origin Policy via the reviver parameter to the JSON.parse method.
{ "binaries": [ { "binary_name": "firefox", "binary_version": "40.0+build4-0ubuntu0.14.04.1" }, { "binary_name": "firefox-dev", "binary_version": "40.0+build4-0ubuntu0.14.04.1" }, { "binary_name": "firefox-globalmenu", "binary_version": "40.0+build4-0ubuntu0.14.04.1" }, { "binary_name": "firefox-mozsymbols", "binary_version": "40.0+build4-0ubuntu0.14.04.1" }, { "binary_name": "firefox-testsuite", "binary_version": "40.0+build4-0ubuntu0.14.04.1" } ], "availability": "No subscription required" }