CVE-2009-1839: Mozilla Firefox

Medium severity, CVSS 5.4. EPSS: 7.1% chance of exploitation in the next 30 days.

Mozilla Firefox 3 before 3.0.11 associates an incorrect principal with a file: URL loaded through the location bar, which allows user-assisted remote attackers to bypass intended access restrictions and read files via a crafted HTML document, aka a "file-URL-to-file-URL scripting" attack.

Affected products

• Mozilla Firefox: up to and including 3.0.10; version 3.0 only; version 3.0.1 only; version 3.0.2 only; version 3.0.3 only; version 3.0.4 only; …

Published 2009-06-12. Last modified 2026-06-16.