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Microsoft said late Wednesday that it plans to release a critical security update today at 1pm PST to plug a security hole present in all supported versions of Windows. The issue surrounds a bug in the Microsoft SMB protocol that allows anyone to access a Windows machine remotely without any user name or password.
Normally, Microsoft issues security updates on Patch Tuesday, the second Tuesday of each month. So for Microsoft to release an emergency patch means that this is a serious bug that is likely exploitable in an easy manner and is already in use.
You can read about the patch here. My advice is that you should download the patch now so that you can protect yourself.