CVE-2015-4478: Canonical Ubuntu Linux

Medium severity, CVSS 5.0. EPSS: 3.4% chance of exploitation in the next 30 days.

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.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.04 only
• Mozilla Firefox: up to and including 39.0.3; version 38.0 only; version 38.0.1 only; version 38.0.5 only; version 38.1.0 only
• Opensuse Opensuse: version 13.1 only; version 13.2 only

Published 2015-08-16. Last modified 2026-06-17.