CVE-2015-4492: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 5.1% chance of exploitation in the next 30 days.

Use-after-free vulnerability in the XMLHttpRequest::Open implementation in Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 might allow remote attackers to execute arbitrary code via a SharedWorker object that makes recursive calls to the open method of an XMLHttpRequest object.

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
• Oracle Solaris: version 11.3 only

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