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The Obvious Invisible Threat: LLM-Powered GUI Agents' Vulnerability to Fine-Print Injections

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arxiv 2504.11281 v1 pith:LCD4RKJN submitted 2025-04-15 cs.HC cs.CLcs.CR

classification cs.HCcs.CLcs.CR
keywords agentsagentattackshumanguisoftenuseractions
verification ladder T0 review T1 audit T2 compute T3 formal
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A Large Language Model (LLM) powered GUI agent is a specialized autonomous system that performs tasks on the user's behalf according to high-level instructions. It does so by perceiving and interpreting the graphical user interfaces (GUIs) of relevant apps, often visually, inferring necessary sequences of actions, and then interacting with GUIs by executing the actions such as clicking, typing, and tapping. To complete real-world tasks, such as filling forms or booking services, GUI agents often need to process and act on sensitive user data. However, this autonomy introduces new privacy and security risks. Adversaries can inject malicious content into the GUIs that alters agent behaviors or induces unintended disclosures of private information. These attacks often exploit the discrepancy between visual saliency for agents and human users, or the agent's limited ability to detect violations of contextual integrity in task automation. In this paper, we characterized six types of such attacks, and conducted an experimental study to test these attacks with six state-of-the-art GUI agents, 234 adversarial webpages, and 39 human participants. Our findings suggest that GUI agents are highly vulnerable, particularly to contextually embedded threats. Moreover, human users are also susceptible to many of these attacks, indicating that simple human oversight may not reliably prevent failures. This misalignment highlights the need for privacy-aware agent design. We propose practical defense strategies to inform the development of safer and more reliable GUI agents.

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Cited by 12 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Invisible Ink Threats: Adversarial Goals Behind Legitimate Tasks in Computer-Use Agents

    cs.CV 2026-08 conditional novelty 7.0 of 10

    Low-severity prompt injections slip past both AI agent safety filters and human confirmation, which in some setups raises attack success.

  2. Mind the Gap: Action Rebinding Attacks against Android GUI Agents

    cs.CR 2026-01 conditional novelty 6.0 of 10

    A zero-permission Android app can redirect a GUI agent's planned tap to a different app by switching the foreground during the agent's reasoning delay.

  3. CaMeLs Can Use Computers Too: System-level Security for Computer Use Agents

    cs.AI 2026-01 conditional novelty 6.0 of 10

    Computer-use agents can run under Dual-LLM isolation with single-shot branching plans, preserving partial utility while blocking instruction injection, but remain open to branch-steering attacks.

  4. Dark Patterns Meet GUI Agents: LLM Agent Susceptibility to Manipulative Interfaces and the Role of Human Oversight

    cs.HC 2025-09 conditional novelty 6.0 of 10

    GUI agents frequently fall for deceptive interface designs, often without recognizing them, and human supervision of agents improves avoidance only partially while introducing new attention and workload costs.

  5. WebGuard: Building a Generalizable Guardrail for Web Agents

    cs.AI 2025-07 conditional novelty 6.0 of 10

    WebGuard introduces an action-level risk dataset for web agents and shows that a fine-tuned 7B model improves risk-prediction accuracy from about 38% to 80% and high-risk recall from 20% to 76%, still below deployment...

  6. MLA-Trust: Benchmarking Trustworthiness of Multimodal LLM Agents in GUI Environments

    cs.AI 2025-06 conditional novelty 6.0 of 10

    MLA-Trust introduces 34 tasks and an evaluation toolbox showing that GUI-interacting multimodal agents are substantially less trustworthy than static multimodal chat models.

  7. Superplatforms Have to Attack AI Agents

    cs.AI 2025-05 conditional novelty 6.0 of 10

    Superplatforms are predicted to launch stealth, black-box attacks on AI agents because agents threaten their ad-based gatekeeping revenue.

  8. Towards Aligning Personalized Conversational Recommendation Agents with Users' Privacy Preferences

    cs.HC 2025-08 conditional novelty 5.0 of 10

    Privacy management for conversational AI agents is reframed as a dynamic alignment problem in which agents learn a user's latent privacy-utility reward function from feedback.

  9. EVA: Evolving Semantic Adversaries for Red-Teaming GUI Agents Against Environmental Injection Attacks

    cs.AI 2025-05 reject novelty 5.0 of 10

    EVA evolves environmental injection payloads through a keyword-utility loop, achieving up to 80% attack success in the body's pop-up tests, while the abstract's stronger claims are not supported by the reported experiments.

  10. A Survey on Autonomy-Induced Security Risks in Large Model-Based Agents

    cs.AI 2025-06 conditional novelty 4.0 of 10

    The paper surveys security risks of LLM agents, organizes them into a five-level autonomy taxonomy, and proposes an untested CMDP-based architecture called R2A2.

  11. A Red Teaming Roadmap Towards System-Level Safety

    cs.CR 2025-05 conditional novelty 4.0 of 10

    A position paper from Scale AI argues that red teaming research should prioritize product-level safety specifications, realistic attacker models, and system-level monitoring over abstract model-level harm benchmarks.

  12. Get Experience from Practice: LLM Agents with Record & Replay

    cs.LG 2025-05 reject novelty 4.0 of 10

    AgentRR is a proposed paradigm that records agent traces, generalizes them into multi-level experiences, and replays them under safety checks to make LLM agents cheaper, faster, and more reliable.

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