Author

Xinlei He

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Preprint Sep 2026

PriMobiBench: Characterizing Visual Privacy Leakage in VLM-Driven Mobile GUI Agents

Mobile GUI agents increasingly rely on Vision-Language Models (VLMs) to automate smartphone tasks by interpreting screenshot streams. However, this design introduces serious and underexplored privacy risks, including direct leakage of sensitive on-screen information and unintended user profiling. The absence of standar...

Qi-Hang Cen, Tianshuo Cong, Da Song et al. · 0 citations

Preprint Aug 2026

Robust Watermarks Meet Backdoored Models: Evading Diffusion Semantic Watermarks via Stealthy Backdoor

GhostVAE is proposed to plant a stealthy backdoor into the encoder of Variational Autoencoder (VAE), enabling reliable evasion of watermark detection and fundamentally undermines the trustworthiness of semantic watermarking systems.

Jinyuan Liu, Tianshuo Cong, Pei Li et al. · 0 citations