CVE-2009-3988: Mozilla Firefox

Medium severity, CVSS 5.0. EPSS: 2.1% chance of exploitation in the next 30 days.

Mozilla Firefox 3.0.x before 3.0.18 and 3.5.x before 3.5.8, and SeaMonkey before 2.0.3, does not properly restrict read access to object properties in showModalDialog, which allows remote attackers to bypass the Same Origin Policy and conduct cross-site scripting (XSS) attacks via crafted dialogArguments values.

Affected products

• Mozilla Firefox: up to and including 3.0.17; version 3.0 only; version 3.0.1 only; version 3.0.2 only; version 3.0.3 only; version 3.0.4 only; …
• Mozilla Seamonkey: version 2.0 only

Published 2010-02-22. Last modified 2026-06-16.