More than half of the world's Web browsers are at risk thanks to a newly discovered vulnerability in Microsoft's Internet Explorer. On Saturday, Microsoft said it was aware of “limited target attacks” that affect versions 6 through 11 of Internet Explorer, which accounts for 56 percent of the Web-browser market. Security firm FireEye discovered the “zero-day threat,” which means there is no time difference between discovering the flaw and someone exploiting it for an attack.
