CVE-2009-4102: Mozilla Firefox

High severity, CVSS 9.3. EPSS: 3.4% chance of exploitation in the next 30 days.

Sage 1.4.3 and earlier extension for Firefox performs certain operations with chrome privileges, which allows remote attackers to execute arbitrary commands and perform cross-domain scripting attacks via the description tag of an RSS feed.

Affected products

• Mozilla Firefox: any version
• Sage.mozdev Sage: up to and including 1.4.3; version 1.3.8 only

Published 2009-11-29. Last modified 2026-06-16.