Prompt injection — untrusted text becomes an instruction
An LLM agent cannot reliably tell data from instructions, so text in a fetched page or a tool result can hijack it — the class with no clean fix and rising stakes as agents gain permissions.
Not yet scoped.
Why
The PoC plants an injection in a document an agent reads and shows it exfiltrating or acting out of scope, then the partial defenses (isolation, allowlists, human-in-the-loop) — the security core of the whole agent stack.