The OWASP top ten list for the year 2013 does not differ much from lists published for previous years, except for changes in ranking. The listed security threats are probably the most severe threats and application developers have to be aware of and protect against these threats.
For more information, see the following:
https://www.owasp.org/index.php/Main_Page
https://www.owasp.org/index.php/Top_10_2013-Top_10
https://www.owasp.org/index.php/Top_10_2013-Risk
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