BEAT: Visual Backdoor Attacks on VLM-based Embodied Agents via Contrastive Trigger Learning - Zhan, Qiusi; Ha, Hyeonjeong; Yang, Rui; Xu, Sirui; Chen, Hanyang; Gui, Liang-Yan; Wang, Yu-Xiong; Zhang, Huan; Ji, Heng; Kang, Daniel (International Conference on Learning Representations, 2026)