Analysis · curated 26 Jul 2026
Prompt Injection Testing: A Practical Guide to Finding and Exploiting LLM Injection Vulnerabilities
First reported repello.ai
Coverage timeline
Single-source analysis — first reported, latest, and curated coincide.
Why it matters
Prompt injection remains the top AI-application vulnerability, and a structured testing methodology across direct, indirect, and multi-turn surfaces helps defenders find injection points before attackers do.
Repello AI's guide walks through how to test LLM applications for prompt injection, covering direct injection, indirect injection via retrieval and tool channels, and multi-turn escalation that bypasses single-turn defenses. It frames prompt injection as OWASP LLM01 and provides practical test cases readers can run against their own AI applications, while promoting the vendor's ARTEMIS Recon red-teaming platform.