PS: I answered ur question, what about mine?
Professionally, Nxt coin is riddled with fundamental issues. I would not invest in it until a independent 3rd party reviews the code.
We don't even have to look at the code to know its flaws. You can go to the Russian section of Bitcointalk (google transate it) and all the problems are talked about there.
So to answer your question about 'injected flaws', I think they are more like 'fundamental flaws'.
In Nxt, the code doesn't even handle private-public key encryption correctly. Hint: A private key is meant to be private... not public!