The (1) Mozilla 1.6, (2) Firebird 0.7, (3) Firefox 0.8, and (4) Netscape 7.1 web browsers do not properly prevent a frame in one domain from injecting content into a frame that belongs to another domain, which facilitates web site spoofing and other attacks, aka the frame injection vulnerability.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9997
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4756
https://exchange.xforce.ibmcloud.com/vulnerabilities/1598
http://www.securityfocus.com/bid/15495
http://www.redhat.com/support/errata/RHSA-2004-421.html
http://www.novell.com/linux/security/advisories/2004_36_mozilla.html
http://www.mandriva.com/security/advisories?name=MDKSA-2004:082
http://www.debian.org/security/2005/dsa-810
http://www.debian.org/security/2005/dsa-777
http://secunia.com/multiple_browsers_frame_injection_vulnerability_test/
http://secunia.com/advisories/11978