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Spectrum scarcity has been a major concern for achieving the desired quality of experience (QoE) in next-generation (5G/6G and beyond) networks supporting a massive volume of mobile and IoT devices with low-latency and seamless connectivity. Hence, spectrum sharing systems have been considered as a major enabler for next-generation wireless networks in meeting QoE demands. Specifically, the 3rd generation partnership project (3GPP) has standardized coexistence of 4G LTE License Assisted Access (LAA) network with WiFi in the unlicensed 5 GHz bands, and the 5G New Radio Unlicensed (NR-U) with WiFi 6/6E in 6 GHz bands. While most current coexistence solutions and standards focus on performance improvement and QoE optimization, the emerging security challenges of such network environments have been ignored in the literature. The security framework of standalone networks (either 5G …