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The Open Web Application Security Project (OWASP) is a non-profit organization that provides guidance on how to develop and maintain secure software applications. OWASP is famous for its Top 10 list of web application security vulnerabilities, which lists the most important security risks affecting web applications.
The OWASP Top 10 list is based on community research and provides data on common vulnerabilities and exploits. It is revised every few years to reflect changes in the industry, such as how common certain attacks are, their business impact and the ease of exploitation.
Even more importantly, the OWASP Top 10 describes each category of application security risks, shows developers how to avoid them in the first place, and provides best practices for remediating them if they already exist.
The first version of the OWASP Top 10 List was released in 2003. Subsequent updates were made in 2004, 2007, 2010, 2013, 2017, and 2021.
In this article we cover the following OWASP web application security risks:
The information below is based on the OWASP Top 10 list for 2021. Note that OWASP Top 10 security risks are listed in order of importance—so A1 is considered the most severe security issue, A2 is next, and A10 is the least severe of the top 10.