CVE-2009-1841: Mozilla Firefox

High severity, CVSS 9.3. EPSS: 4.8% chance of exploitation in the next 30 days.

js/src/xpconnect/src/xpcwrappedjsclass.cpp in Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 allows remote attackers to execute arbitrary web script with the privileges of a chrome object, as demonstrated by the browser sidebar and the FeedWriter.

Affected products

• Mozilla Firefox: up to and including 3.0.10; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …
• Mozilla Seamonkey: up to and including 1.1.16; version 1.0 only; version 1.0.1 only; version 1.0.3 only; version 1.0.4 only; version 1.0.6 only; …
• Mozilla Thunderbird: up to and including 2.0.0.19; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …

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