What can someone do after discovering a "exploit"?

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http://www.backtrack-linux.org – Ok, what happened is that I discovered a exploit that enables me to get the default wireless password from any router (no matter which protection the router has, no matter which model it is) of a given brand of routers. So now I have a dilemma... Should I try to contact the enterprise that produces such routers, and try to warn them? Should I make my findings available to the whole world to see? Or should I just keep quiet about it? I'm just a student, I have no professional experience in the Security area, so I don't know if the enterprise would take me seriously. I know that if I disclose w (HowTos)