This report by the NGMN Alliance examines the security aspects of network capabilities in 5G. It highlights the potential risks and vulnerabilities that may arise with the increased use of network slicing and other advanced features in 5G networks. The report emphasizes the importance of security in 5G networks and the need for industry-wide collaboration to address the challenges. It also provides recommendations for operators and vendors to enhance the security of 5G networks. Overall, the report underscores the critical role of security in the successful deployment and adoption of 5G technology.