I need to check web security and vulnerability in my web application. Whatever free vulnerability scanners application or vulnerability scan online site's are available?
closed as off topic by Lucas Kauffman, schroeder, Rory Alsop♦ Dec 28 '12 at 15:53
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It can be difficult to know which web app scanner is good, but there is a nearly famous researcher who came up with a way to benchmark various tools:
His findings point to:
As high-quality open source scanners.
PLEASE NOTE that no automated scanner can find everything and manual verification and testing also needs to be performed. Automated scanners are good for the "low-hanging fruit" but not for certifying that a site is 'safe'.