🛡️ Prompt injection is permanent risk — manage it, don't fix it
PM Prompt Injection Defense
(2026 Edition)
4 attack types and 5 defense layers.
Build AI Security PM Skills — Free →4 Attack Types
1.
Direct injection — user types adversarial prompt
2.
Indirect injection — adversarial content in docs the agent reads
3.
Exfiltration — trick agent into leaking secrets
4.
Tool abuse — convince agent to call dangerous tools
5 Defenses
1.
System prompt isolation — separate trusted from untrusted input
2.
Input classifiers — flag adversarial patterns
3.
Output filtering — block sensitive data leakage
4.
Tool-call whitelisting — explicit allow lists
5.
Human approval for high-impact actions
FAQ
Can prompt injection be fully solved?
No — like SQL injection, it's an architectural challenge that requires defense in depth. Mitigations reduce risk; they don't eliminate it. PMs designing AI products should treat prompt injection as a permanent risk to manage, not a bug to fix.