GhostEI-Bench: Do Mobile Agent Resilience to Environmental Injection in Dynamic On-Device Environments? - Chen, Chiyu; Song, Xinhao; Chai, Yunkai; Yao, Yang; Zhao, Haodong; Li, Lijun; Li, Jie; Teng, Yan; Liu, Gongshen; Wang, Yingchun (International Conference on Learning Representations, 2026)