15 min read
AI prompt injection: how it works and how to reduce risk in real applications
Learn the difference between direct and indirect AI prompt injection, why prompt wording alone is not a security boundary, and how to build layered defenses.
- Prompt injection happens when untrusted content changes an AI system’s behavior beyond the user’s intended task.
- A stronger system separates instructions from data, limits permissions, validates actions and outputs, and requires approval for consequential operations.
- Security testing must cover direct input, retrieved documents, webpages, email, tool results, memory, and every path that can place text in model context.