A few days ago I was browsing a particular commerical web site, the site crashed and I encountered the "White Screen of Death". The detailed dump showed me what the site was using:
Besides all this detailed information of use to a hacker, the copyright on Magento cited a date of 2009. Does this means that out of date software was in use?
There is a more basic point - in your site please ensure that fatal errors are trapped and redirected to a page that gives away no information useful to a hacker. I suggest also that you provide a means for an administrator to simulate an error to check the error handling.