This paper discusses the security system in Commonwealth Bank, identifies security vulnerabilities, and proposes a security policy to mitigate threats. The paper evaluates the condition of the security system in the Commonwealth Bank and makes recommendations for the improvement and modification of the overall security system of the bank. The proposed security policy is dedicated to the maintenance of the security of the technical systems of the organization. Ensuring the security of the technical functions in the organization will help to decrease the possibility of the cyber crime and the other security threats regarding the breaching of the data.