Prompt Injection Attacks on AI Agents: What Business Owners Need to Know

You build an AI agent to process vendor invoices. It reads emails, checks amounts, routes payments. Works great in testing. Three weeks later, you find out the agent has been approving purchases up to $500,000 without human review. A malicious actor slowly convinced it that this was the correct policy. That is prompt injection. In 2026, it is the #1 security vulnerability for deployed AI agents according to the OWASP LLM Security Project. Before you deploy an agent that touches money, data, or e