The flaw is a privilege escalation vulnerability. Anyone who can run code on a Windows system can elevate her privileges to the highest level, and accordingly install back doors, compromise sensitive data, and so on.
I do not know why but reading that sentence just distracted me a moment, it made me wonder who was the hacker, since she is apparently female. On a hilarious note, many comments were used to discuss that very sentence in the comments section. Happy readings.