Microsoft has issued an emergency security alert about an in-the-wild exploitable vulnerability in Word.
To clarify the jargon in that first sentence:
A vulnerability is the flaw that caused the bug that could let crooks get in.
An exploit is a way for the crooks to use a vulnerability in practice, and actually get in.
In the wild means the crooks not only can get in, but are actively doing so already.
If that sounds rather bad, it is