Security researchers on Monday warned of <A HREF="http://news.zdnet.com/2100-1009_22-6130614.html?tag=nl.e550">a problem in Internet Explorer 7</A> that could allow malicious attackers to alter content in a legitimate Web site's pop-up window. The browser issue could affect users who visit a trusted site by opening a pop-up window in that site that contains malicious code. This is the second IE 7 problem that has been discovered since Microsoft released the browser two weeks ago.