Join Mandiant’s ThreatSpace and hone your skills against an advanced threat actor in an engaging exercise suitable for all levels. Learn how to apply practical threat intelligence and overcome real attacks with real skills for real impact. Challenges run concurrently with breakout sessions. A Prompt Injection Vulnerability occurs when an attacker manipulates an LLM’s behavior or output by submitting crafted inputs that the model mistakenly interprets as developer instructions. Because LLMs process both system instructions (how the model should behave) and external user data (the content the model processes) in the same natural language channel, the model struggles to distinguish between the two. This lack of segregation allows untrusted input to override the system's guardrails and operational guidelines.