entional vulnerability detection fails to extend its generic form to an abstract level in coping with particular type of string validation. Consequently the security bypasses key issues such as Java scripting and SQL injection. It causes tremendous business loss and customers risk due to taint distribution and illegal data manipulation. This paper introduces semantic analysis by using metadata codes, as well as a hierarchical parser in token-based algorithmic check. Our research in SOA web security can help industry to minimize business impact, to achieve higher accuracy in vulnerability detection, and to commit fast responsiveness.