This document discusses current security issues for cloud computing. It begins by defining cloud computing and describing its key characteristics and delivery models. It then outlines the main security problems which stem from loss of control, lack of trust, and multi-tenancy in cloud environments. Specifically, it examines issues relating to network security, data security, virtualization, interfaces, and governance in cloud computing. It concludes that while cloud computing provides scalable resources, it also introduces both traditional and new security threats for users.