The purpose of this study is to develop and present security assessment models to manage the quality of Web2 mobile environments. Web 2 is an evolved concept of web from Web 1.0 and Web 2.0 which means, diverse services and technologies including Real-time service, Social Network Services, Augmented Reality technology and Location Based Service are realized in mobile environment. However, compared to Web 1.0 and Web 2.0, few studies have been conducted for the security issues of Web2 mobile environment. To be prepared for such issues, this paper reviews the characteristics of security in Web2 mobile environments and present security assessment models in perspectives of Sensor-generated threats and User-generated threats. This study is significant in that it presents the directionality of the security issues to be discussed later in Web2 mobile environments. This study will have implications for businesses and researchers preparing Web2 mobile services and marketing.