Firefox before 1.0.3 and Mozilla Suite before 1.7.7 allows remote attackers to execute arbitrary script in other domains via a setter function for a variable in the target domain, which is executed when the user visits that domain, aka "Cross-site scripting through global scope pollution."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10339
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A100022
https://bugzilla.mozilla.org/show_bug.cgi?id=289675
http://www.securityfocus.com/bid/15495
http://www.securityfocus.com/bid/13230
http://www.redhat.com/support/errata/RHSA-2005-386.html
http://www.redhat.com/support/errata/RHSA-2005-384.html
http://www.redhat.com/support/errata/RHSA-2005-383.html
http://www.mozilla.org/security/announce/mfsa2005-36.html
http://www.gentoo.org/security/en/glsa/glsa-200504-18.xml