Prompt Injection in Agentic Workflows 2026 — When AI Agents Act on Malicious Instructions

📰 Originally published on SecurityElites — the canonical, fully-updated version of this article. Agentic injection is the one that concerns me most in 2026. Standard prompt injection produces a wrong answer that a human can read and discard. Agentic injection produces a wrong action that a human may not know happened until the consequences have landed. The difference between the two is whether the AI has tool access and autonomous execution capability — and increasingly, it does. An AI agent ta