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CMS Made Simple Development Cookbook by Samuel Goldstein

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Using URL parameters safely in a User-Defined Tag

When people started writing code for website forms and data input, security was not much of a consideration — after all, websites were mostly run by researchers to share their research. It was fine to have code that made assumptions about incoming data, even for sites that faced the open Internet. Those innocent days are long gone, of course. Websites are subjected to continuous threats by automated attack scripts and malicious users looking to deface, hijack, or abuse accounts. Spammers, Phishers, Crackers, and other unsavory types can be expected to look for vulnerabilities in your code.

Today, securing web applications is a vital part of the development process.

As you can see in the "Restricting ...

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