The Plugin Finder Service (PFS) in Firefox before 1.0.3 allows remote attackers to execute arbitrary code via a javascript: URL in the PLUGINSPAGE attribute of an EMBED tag.
secunia.com/advisories/14938
www.mozilla.org/security/announce/mfsa2005-34.html
www.redhat.com/support/errata/RHSA-2005-383.html
www.securityfocus.com/bid/13228
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A100024
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10279