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Cybersecurity•7 min read

Indirect Prompt Injection in RAG Pipelines: What Red Teams Found

O
Offensive AI Security LabRed Team & Threat Intelligence
September 24, 2026
Red teams have proven that untrusted documents ingested by RAG pipelines can covertly hijack autonomous agents into exfiltrating corporate data or initiating unauthorized state changes.

The Anatomy of Indirect Prompt Injection

Adversaries embed hidden instructions inside PDFs, invoices, and website text. When the agent summarizes the file, it executes the adversary's instructions.

Executive Summary & Core Takeaways

  • ✓System prompts cannot prevent indirect prompt injection.
  • ✓Deterministic network and API gates are the only reliable barrier.

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