Enterprise AI Glossary · Reviewed June 2026
Prompt Injection
An attack where malicious input causes an AI system to ignore its instructions or execute unintended actions.
What is Prompt Injection?
Prompt injection — both direct (user input) and indirect (via retrieved content) — is the most discussed LLM security risk. Defences include input sanitisation, instruction-data separation, output filtering, and treating retrieved text as data rather than instructions. No single defence is complete; layered guardrails at the platform level are required. See AI Guardrails and Enterprise AI Agent Security.
Related terms
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