CVE-2017-5409: Mozilla Firefox

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

The Mozilla Windows updater can be called by a non-privileged user to delete an arbitrary local file by passing a special path to the callback parameter through the Mozilla Maintenance Service, which has privileged access. Note: This attack requires local system access and only affects Windows. Other operating systems are not affected. This vulnerability affects Firefox ESR < 45.8 and Firefox < 52.

Affected products

• Mozilla Firefox: before 52.0 (fixed in 52.0); before 45.8.0 (fixed in 45.8.0)

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