CVE-2004-0906: Mozilla

Medium severity, CVSS 4.6. EPSS: 0.4% chance of exploitation in the next 30 days.

The XPInstall installer in Mozilla Firefox before the Preview Release, Mozilla before 1.7.3, and Thunderbird before 0.8 sets insecure permissions for certain installed files within xpi packages, which could allow local users to overwrite arbitrary files or execute arbitrary code.

Affected products

• Mozilla Mozilla: version 0.8 only; version 0.9.2 only; version 0.9.2.1 only; version 0.9.3 only; version 0.9.4 only; version 0.9.4.1 only; …
• Mozilla Thunderbird: version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; version 0.6 only; …

Published 2004-12-31. Last modified 2026-06-16.