The Flash vulnerability reported on December 11 has finally been fixed in Internet Explorer 10.

Microsoft chose not to use the regular Flash plugin in Internet Explorer 10, deciding instead to integrate the player into the IE10 code. As a result, any time the Flash player is updated, Microsoft must make corresponding changes to IE10. Hence the delay in producing the patch for IE10. Google now does the same thing with their Chrome browser, but they tend to make the required changes much more quickly.