Xiwen Teoh

I'm a Ph.D. student in CS at the National University of Singapore, advised by Prof. Jin Song Dong. My research focuses on self-evolving agentic AI for web security, GUI testing, and automated software engineering. I work in close collaboration with Prof. Yun Lin at the Data-Driven Software Technology Lab (DDST), Shanghai Jiao Tong University (SJTU).

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 /
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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 /
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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 /
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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