ColdFusion is a Web application development tool that allows programmers to quickly build robust applications using server-side markup language. It is incredibly popular and has both an established user base and a quickly growing number of new adoptions. It has become the development environment of choice for e-commerce sites and content sites where databases and transactions are the most vulnerable and where security is of the utmost importance. Several security concerns exist for ColdFusion due to its unique approach of designing pages using dynamic-page templates rather than static HTML documents. Because ColdFusion does not require that developers have expertise in Visual Basic, Java and C++; Web applications created using ColdFusion Markup language are vulnerable to a variety of security breaches. Hack Proofing ColdFusion 5.0 is the seventh title in the popular Hack Proofing series and provides developers with step-by-step instructions for developing secure web applications.