Mozilla Firefox 1.x before 1.5 and 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, and SeaMonkey before 1.0 allows remote attackers to inject arbitrary Javascript into other sites by (1) "using a modal alert to suspend an event handler while a new page is being loaded", (2) using eval(), and using certain variants involving (3) "new Script;" and (4) using window.__proto__ to extend eval, aka "cross-site JavaScript injection".
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9167
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1855
https://exchange.xforce.ibmcloud.com/vulnerabilities/25806
http://www.vupen.com/english/advisories/2006/1356
http://www.securityfocus.com/archive/1/438730/100/0/threaded
http://www.securityfocus.com/archive/1/436338/100/0/threaded
http://www.securityfocus.com/archive/1/436296/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2006-0330.html
http://www.redhat.com/support/errata/RHSA-2006-0329.html
http://www.redhat.com/support/errata/RHSA-2006-0328.html
http://www.redhat.com/archives/fedora-announce-list/2006-April/msg00154.html
http://www.redhat.com/archives/fedora-announce-list/2006-April/msg00153.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:078
http://www.mandriva.com/security/advisories?name=MDKSA-2006:076
http://www.gentoo.org/security/en/glsa/glsa-200605-09.xml
http://www.gentoo.org/security/en/glsa/glsa-200604-18.xml
http://www.gentoo.org/security/en/glsa/glsa-200604-12.xml
http://www.debian.org/security/2006/dsa-1051
http://www.debian.org/security/2006/dsa-1046
http://www.debian.org/security/2006/dsa-1044
http://support.avaya.com/elmodocs2/security/ASA-2006-205.htm
http://secunia.com/advisories/21622
http://secunia.com/advisories/21033
http://secunia.com/advisories/20051
http://secunia.com/advisories/19950
http://secunia.com/advisories/19941
http://secunia.com/advisories/19902
http://secunia.com/advisories/19863
http://secunia.com/advisories/19862
http://secunia.com/advisories/19852
http://secunia.com/advisories/19823
http://secunia.com/advisories/19821
http://secunia.com/advisories/19811
http://secunia.com/advisories/19780
http://secunia.com/advisories/19759
http://secunia.com/advisories/19746
http://secunia.com/advisories/19729
http://secunia.com/advisories/19721
http://secunia.com/advisories/19714