Xiwen Teoh

I'm a Ph.D. student in Computer Science at the National University of Singapore (NUS), advised by Prof. Jin Song Dong and Prof. Yun Lin from the CoPhi Research Group at Shanghai Jiao Tong University (SJTU).

My research focuses on self-evolving agentic AI (e.g., large action models, vision-language models, etc.) for web security, GUI testing, and automated software engineering.

Github / Google Scholar / LinkedIn / Email

Publications

(*): Co-first Author

Are CAPTCHAs Still Bot-hard? Generalized Visual CAPTCHA Solving with Agentic Vision Language Model

USENIX Security 2025 /
Paper /
Website /
Code

Xiwen Teoh,
Yun Lin,
Siqi Li,
Ruofan Liu,
Avi Sollomoni,
Yaniv Harel,
Jin Song Dong
GUIPilot: A Consistency-based Mobile GUI Testing Approach for Detecting Application-specific Bugs

ISSTA 2025 /
Paper /
Website /
Code

Ruofan Liu*,
Xiwen Teoh*,
Yun Lin,
Guanjie Chen,
Ruofei Ren,
Denys Poshyvanyk,
Jin Song Dong
Detecting and Explaining Anomalies Caused by Web Tamper Attacks via Building Consistency-based Normality

ASE 2024 /
Paper /
Website /
Code

Yifan Liao,
Ming Xu,
Yun Lin,
Xiwen Teoh,
Xiaofei Xie,
Ruitao Feng,
Frank Liauw,
Hongyu Zhang,
Jin Song Dong
Less Defined Knowledge and More True Alarms: Reference-based Phishing Detection without a Pre-defined Reference List

USENIX Security 2024 /
Paper /
Website /
Code

Ruofan Liu,
Yun Lin,
Xiwen Teoh,
Gongshen Liu,
Zhiyong Huang,
Jin Song Dong
PhishDecloaker: Detecting CAPTCHA-cloaked Phishing Websites via Hybrid Vision-based Interactive Models

USENIX Security 2024 /
Paper /
Website /
Code

Xiwen Teoh,
Yun Lin,
Ruofan Liu,
Zhiyong Huang,
Jin Song Dong