Cloud computing refers to high scalable computing applications, storages and platforms as a service to companies, individuals and governments. Therefore, SMB (Small and Medium Business) organizations are adapting cloud computing services gradually to save cost and to increase efficiency in their business environment. While cloud service benefits and robustness are comprehensible, but now more concern about security in cloud computing “How much secure is cloud computing environment?”. Noted that security is one of the main barrier for continuing growth of cloud computing. For some major security risks and issues enterprises and individuals are unwilling to deploy their data and applications in cloud environment. In this paper, the main objective is to identified major security risks and issues those are need to think about during deployment and development of services in cloud and the way how to mitigate those security risks and issues. However, it is significant to know that, cloud computing is not insecure primarily, it just needs to be managed and accessed securely.