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_version": "40.0+build4-0ubuntu0.14.04.1",
"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"
}
],
"availability": "No subscription required"
}