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IT services and computing has become widespread in an Enterprise.Today, enterprise considers data and business processes are very crucial and guard them from access control and compliance policies. In the SaaS model, enterprise data is stored at the site of the provider. The cloud provider replicate the data at different location for quick availability. So, there is a strong concern about data breaches, application vulnerabilities and availability that may lead to financial and legal issues. This article highlights on security issues for SaaS based cloud service.