Update: There is now a fix available. Run Windows Update or go get it: https://support.microsoft.com/kb/2961887
Well, just as the news of HeartBleed winds down, here's another serious alert. This time, a security vulnerability in all versions of Internet Explorer that is actively being exploited in what the internet hype machine is calling "Operation Clandestine Fox". No fix is available, though one will most likely be out shortly. Homeland Security is taking the drastic step of recommending not using IE.
In the meantime, Chrome is your huckleberry. Lest Google and Apple fanboys get too cocky, 3 days ago saw a similar issue patched by Google and by Apple.