The Fundamental Flaw: Why Prompt Injection Dominates LLM Security Threats

Prompt injection has maintained the #1 position in OWASP's LLM security rankings and has escalated from an academic curiosity to an active enterprise threat as agentic AI systems deploy with real-world capabilities. The vulnerability persists not because of weak prompt engineering, but because transformer-based models fundamentally cannot distinguish between system instructions and untrusted user data at the architectural level. Organizations must recognize this as an architecture problem, not a prompt problem, to effectively mitigate the risk.