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Mao-Sen Zhang

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#artificial intelligence Preprint Oct 2026

The Show-Up Attack: When Subagents Win Over Their Supervisor

The proposed SUA-Arena, which implements 6 attack strategies and contains 188 test cases, finds that all of them are vulnerable to show-up attacks and shows that multi-agent systems need explicit mechanisms for enforcing authority boundaries.

Mao-Sen Zhang, Jian-Shuo Dong, Yu-Tong Zhang et al. · 0 citations
Preprint Aug 2026

The Model's Tell: Measuring Context-Leakage Attack Signals with Behavior Gauges

This paper proposes LeakGauge, which probes this response by appending a suffix that gauges leakage behavior and mapping its prefill token probabilities to an attack-risk score, and shows that the risk score is sensitive to an internal leakage-related direction.

Maosen Zhang, Jianshuo Dong, Bo-Han Lu et al. · 1 citation
Preprint Aug 2026

Your Agentic LLMs Secretly Encode Indirect Prompt-Injection Exposure in Hidden States

A probe-gated reasoning-based defense is introduced to bridge a knowledge-action gap in agentic LLMs when they are exposed to IPI attacks, and an analysis framework is introduced that identifies natural-language explanations strongly correlated with probe-captured signals.

Jianshuo Dong, Yiming Liu, Maosen Zhang et al. · 1 citation · ⚡1

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