Cloud Computing is the big evolution in the Information Technology industry. From giant organizations to small retail shops, everyone is moving to the cloud. Till now the Zettabytes of data are already migrated to cloud from private systems, and it is still growing. The actual concern starts when the data is being transferred, stored in some cloud storage, and then accessed. Attackers may attack with various techniques and can steal your data leading to severe security issues. Cloud Service Providers (CSP) must have a robust mechanism to protect their cloud resources from such attacks and ensure the data confidentiality, integrity, and security. If there are any loopholes, it will badly affect the trust computation of that CSP. In this paper we have done a comprehensive study and analysis of the threats in cloud computing which can affect the trust computation of CSPs and discussed the mitigations to those threats.