Microsoft confirms critical Windows Defender vulnerability. What you need to do right now.

There is (or was) a vulnerability in Windows Defender, but you don't have to worry about it. That's the short version.

The longer version, for those who are interested, is that Microsoft detected a fault in its homegrown antivirus software and admitted as much in an official security note, per Forbes. Microsoft's security note included an executive summary that explained the problem in something resembling layman's terms:

"Improper authorization of an index that contains sensitive...