Unauthorized Digital Certificates Could Allow Spoofing

[Georgi Guninski <guninski () guninski com>]

http://technet.microsoft.com/en-us/security/advisory/2718704
Microsoft is aware of active attacks using unauthorized digital certificates derived from a Microsoft Certificate 
Authority.

what does this mean?

m$ inadvertently gave signing rights to lusers, they got rooted 
or something else?

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