The impact of localization systems in our daily lives is increasing. As next-generation networks will introduce hyper-connectivity with emerging applications, this impact will undoubtedly further increase, proliferating the importance of location information's reliability. As society becomes more dependent on this information in terms of products and services, security solutions will have to be enriched to provide countermeasures sufficiently advanced to ever-evolving threats, forcing the joint design of communication and localization systems. This article envisions integrated communication and localization systems by focusing on localization security. Also, conventional and next-generation attacks on localization are discussed along with an efficient attack detection method and a testbed-based demonstration, highlighting the need for effective countermeasures.