WebTrap: Stealthy Mid-Task Hijacking of Browser Agents During Navigation
Browser agents are increasingly deployed in long-horizon tasks, which require executing extended action chains to accomplish user goals. However, this prolonged execution process provides attackers with more opportunities to inject malicious instructions. Existing prompt injection attacks against browser agents expose two key gaps: (1) low effectiveness, as attacks optimized for toy baselines fail to achieve end-to-end goals in real-world scenarios with complex environments and longer steps; (2) weak stealthiness, since most attacks pit the attack goal against the user goal, causing a significant drop in system usability under attack. To address these gaps, we propose WebTrap, a mid-task ...
| Authors | Zhichao Liu, Wenbo Pan, Haining Yu et al. |
|---|---|
| Primary category | cs.CR |
| Published | 8 May 2026 |
| Last updated at source | 8 May 2026 |
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