Abstract: With more and more people becoming Internet users there have been great increase in using Web in all areas of life, including communication, education and shopping. And as a result of these changes the security concerns have also grown. The web application vulnerability scanners help reduce these security concerns in Web-based applications. In today's market a large number of web scanners are available. Although these tools are available in the market but question is how efficient they are to address security concerns in WEB applications? The primary objective of the paper is to study the effectiveness of the scanners and to try to identify common types of vulnerabilities in web services environment. Also, one of the prominent objectives is to provide defense measures, which secure the application significantly.