Publications and research artifacts.

USENIX Security ’26 · Accepted

COGNITION: From Evaluation to Defense against Multimodal LLM CAPTCHA Solvers

Junyu Wang, Changjia Zhu, Yuanbo Zhou, Lingyao Li, Xu He, Mingkui Wei, Junjie Xiong

COGNITION maps the practical boundary of automated visual CAPTCHA solving and turns that evidence into concrete redesign guidance. The study pairs broad evaluation with a defense case study that reduces state-of-the-art solver success from over 95% to 0%.