18 Ways Your LLM App Can Be Hacked (And How to Fix Them)

You spent weeks building your LLM-powered app. You tested the happy path. Users love it. But did you ask: what happens when someone tries to break it? Most teams don't. And that's a problem - because LLM apps have a completely new attack surface that traditional security tools don't cover. Here are 18 real ways attackers go after LLM systems right now. Prompt Attacks 1. Direct Prompt Injection User types instructions that override your system prompt. "Ignore previous instructions and. " - classic. Still works on most apps. 2.