A regression error in Firefox 1.0.3 and Mozilla 1.7.7 allows remote attackers to inject arbitrary Javascript from one page into the frameset of another site, aka the frame injection spoofing vulnerability, a re-introduction of a vulnerability that was originally identified and addressed by CVE-2004-0718.

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.