CVE-2012-0458: Mozilla Firefox

Medium severity, CVSS 6.8. EPSS: 2.8% chance of exploitation in the next 30 days.

Mozilla Firefox before 3.6.28 and 4.x through 10.0, Firefox ESR 10.x before 10.0.3, Thunderbird before 3.1.20 and 5.0 through 10.0, Thunderbird ESR 10.x before 10.0.3, and SeaMonkey before 2.8 do not properly restrict setting the home page through the dragging of a URL to the home button, which allows user-assisted remote attackers to execute arbitrary JavaScript code with chrome privileges via a javascript: URL that is later interpreted in the about:sessionrestore context.

Affected products

• Mozilla Firefox: up to and including 3.6.27; after 4.0, up to and including 10.0; version 10.0 only; version 10.0.1 only; version 10.0.2 only
• Mozilla Seamonkey: affected versions not specified; version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.0.4 only; …
• Mozilla Thunderbird: from 1.0, up to and including 3.1.19; after 5.0, up to and including 10.0
• Mozilla Thunderbird ESR: version 10.0 only; version 10.0.1 only; version 10.0.2 only

Published 2012-03-14. Last modified 2026-06-16.