Executive Summary
Trend Micro describes AI agents being manipulated by indirect prompt injection in web pages, images and documents to exfiltrate sensitive data without user interaction.
What Happened
TrendAI describes how AI agents can be manipulated through indirect prompt injection hidden in web pages, images, and documents, leading to sensitive data exfiltration without user interaction. The article also discusses document-based payloads and recommends access controls, filtering, and real-time monitoring.
Vulnerability / Attack Technique
Indirect prompt injection leading to data exfiltration
Technical Mechanism
Hidden instructions in content the agent processes lead it to send data out.
AI Security Category
LLM01:2025 Prompt Injection
Part of the Prompt Injection topic.
Relevant Frameworks
RealGround Analysis
Many content types carry instructions. RealGround analysis: combine access control, filtering and real-time monitoring.
Recommended Controls
- Apply access controls to agent data
- Monitor agent activity in real time
Related RealGround Service
Secure AI Agent Build · or start with the free AI Agent Security Scanner.
Sources
Trend Micro TrendAI Security: https://www.trendaisecurity.com/en-us/resources-insights/research/unveiling-ai-agent-vulnerabilities-part-iii-data-exfiltration
Summary and analysis written by RealGround from the source above; last updated 2026-10-18.