AWS Kiro: Arbitrary Code Execution via Indirect Prompt Injection

AWS Kiro, a coding agent tool, is vulnerable to arbitrary code execution through indirect prompt injection (a technique where hidden instructions in data trick an AI into following them). An attacker who controls data that Kiro processes can modify configuration files like .vscode/settings.json to allowlist dangerous commands or add malicious MCP servers (external tools that extend Kiro's capabilities), enabling them to run system commands or code on a developer's machine without the developer's knowledge or approval.