Microsoft's claim that Windows 8 is super secure has been rubbished by a French insecurity outfit which turned the operating system into a mild Camembert.
VUPEN is famous for finding exploits in popular software and sells them to governments or companies around the world so that they can either protect themselves or hack rivals.
It looks like the company could move so fast was thanks to multiple already-existing 0-days that VUPEN found and did not disclose publicly.
Fortunately for Microsoft, typical hackers would take a fair bit of time to work out this vulnerability and VUPEN would have been playing around with the OS long before it was released publicly.
Microsoft said that as further details have not been shared with it, there was not a lot it could do.