Bypass Windows defenses without leaving any trace on the machine.

The strange part is that someone accidentally discovered it and exposed it.
So, I am wondering who else knew about it and has been using it.
Is this a vulnerability or kind of backdoor?

From the Article:
The flaw doesn’t trigger the AppLocker security software, which is supposed to only let users run apps from trusted sources, and it doesn’t leave any traces in the registry, as it doesn’t need administrator access.

Microsoft has not yet provided a fix for the issue, but users can disable the Regsvr program using Windows Firewall.



For More info
http://bgr.com/2016/04/25/windows-10-applocker-security-issue/