CVE-2016-2826: Mozilla Firefox

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

The maintenance service in Mozilla Firefox before 47.0 and Firefox ESR 45.x before 45.2 on Windows does not prevent MAR extracted-file modification during updater execution, which might allow local users to gain privileges via a Trojan horse file.

Affected products

• Mozilla Firefox: version 45.1.0 only; version 45.1.1 only; up to and including 46.0.1

Published 2016-06-13. Last modified 2026-06-17.