Arnav Sharma • 6/27/2026

Best Practices to Prevent Prompt Injection Attacks

This article provides a comprehensive guide on preventing prompt injection attacks in generative AI systems, based on real-world incidents like the EchoLeak vulnerability in Microsoft 365 Copilot. It explains what prompt injection is, why it's a critical risk (OWASP LLM01), and offers a defense-in-depth architecture grounded in OWASP, ACSC, and Five Eyes guidance. Written for security architects, CISOs, and cloud engineers, it includes practical controls for protecting Copilot, Azure OpenAI, and agentic AI systems against this actively exploited attack class.

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#prompt injection #llm security #AI Safety