Web security issue help

Raakesh kumar <[email protected]>
Newsgroups gmane.user-groups.linux.delhi
Message-ID <CAEid6wGh=Hnb4MV9OwyECkRfP+p5=srYA-ghb+utaMkj7XzR8Q@mail.gmail.com>
Hi,
we have a website http://www.brahmabooks.com which is developed in core php
without any framework or anything. Today someone mailed us with few user
details saying that he has hacked our system. Now i don't understand how
could someone display all details from our database. We have used PHP PDO
with parameterized query and have tested against lots of sql injection
techniques and found it injection proof. I found that Cookies are not
encrypted and are stored in plain data which i have to take care of but is
it possible to get table columns and data with this detail?
Can someone guide me how can i secure it and how he would have got these
details?
Thanks


-- 
Regards
RAKESH KUMAR
http://raakeshkumar.wordpress.com
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