Being that we don't know your TRUE intention's (even though you say it's for good use) we can not just give out exploit information. If you wanna learn about exploit's and you wanna find them, use google. We at AntiOnline don't promote sharing/giving exploit's out especially to people who might use them for a malicious purpose.
Shut up. You can never really know; the best bet is to inform then hope they make the right decision about the use of the information.

www.securityfocus.org

-Cheers-