Using OpenAI Codex to Automate Indirect Prompt Injection Attacks Against Claude Sonnet on Amazon Bedrock
By
Antero Guy
Summary
This article details the author's process of using OpenAI's Codex to automate the generation, testing, and refinement of indirect prompt injection payloads targeting agentic AI systems running Claude Sonnet 4.5 and 4.6 models on Amazon Bedrock. The project started as an effort to build a basic AI chatbot, evaluate it against AI-specific attacks, add defensive controls, and test those defenses. The specific attack technique examined is indirect prompt injection, which differs from direct prompt injection in its approach.
Source
bskyUsing OpenAI Codex to Automate Indirect Prompt Injection Attacks Against Claude Sonnet on Amazon Bedrockghst.lyKey quotes
· 3 pulledThis project began as a relatively straightforward effort.
I wanted to build a basic AI chatbot, evaluate it against AI-specific attacks, add defensive controls, and then see how well those defenses held up in practice.
Unlike direct prompt injection, where an atta...
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