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Beating software's cross-site scripting, authentication problems

What are the most common Web security issues that we should focus most of our efforts on?

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There are literally thousands of Web-related vulnerabilities and you'd go crazy and spend an awful lot of money trying to rid your Web-based systems of every little flaw. The biggest issues I see are cross-site scripting, authentication mechanism weaknesses, and application logic vulnerabilities. If you focused just on those three things you'd easily eliminate 90+ percent of your Web vulnerabilities.

In the case of software security, your best offense is a strong offense and an equally strong defense. Identifying issues before an application is launched is your best bet when offering up a stable online app. If you look below you will see I have collected a battery of Web 2.0 and application security tips and articles. These should prove invaluable to you and anyone else concerned with Web security.

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This was first published in December 2009

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