<A target="_blank" href="http://www.pcworld.com/article/204932/Microsoft_Investigates_Bug_In_Internet_Explorer.html?tk=rss_news">The vulnerability has been around for years, perhaps since 2002.</A> Internet Explorer 8 has been said to be "most vulnerable" to the flaw which will be fixed in IE9. A patch for IE8 is expected as part of next week's Patch Tuesday.