CVE-2016-9073: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

WebExtensions can bypass security checks to load privileged URLs and potentially escape the WebExtension sandbox. This vulnerability affects Firefox < 50.

Affected products

• Mozilla Firefox: before 50.0 (fixed in 50.0)

Published 2018-06-11. Last modified 2026-06-17.