Firefox before 1.0.4 and Mozilla Suite before 1.7.8 does not properly implement certain security checks for script injection, which allows remote attackers to execute script via "Wrapped" javascript: URLs, as demonstrated using (1) a javascript: URL in a view-source: URL, (2) a javascript: URL in a jar: URL, or (3) "a nested variant."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10351
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A100015
http://www.vupen.com/english/advisories/2005/0530
http://www.securityfocus.com/bid/15495
http://www.securityfocus.com/bid/13641
http://www.redhat.com/support/errata/RHSA-2005-435.html
http://www.redhat.com/support/errata/RHSA-2005-434.html
http://www.mozilla.org/security/announce/mfsa2005-43.html