Forget Deepfakes or Phishing: Prompt Injection is GenAI's Biggest Problem

The report analyzes prompt injection as a leading adversarial technique against GenAI/LLM systems, outlining direct and indirect injection methods, multimodal prompts via images, and how agent frameworks and plugin/API integrations can escalate risks to data exfiltration, policy bypass, and confused-deputy automation abuse. Referencing NIST guidance and WithSecure research (e.g., manipulating ecommerce refund agents), it argues that current mitigations—rules-based filters, ML-based screening, and early “LLM firewalls”—are insufficient, leaving prompt injection an urgent, unresolved security challenge.