Fetching from the wire…
01
02
03
04
05
06
07
08
Public story · 2026-03-15 · source-backed
The attack vector evolution is documented: 2024 saw direct prompt injection, 2025 shifted to indirect via poisoned documents, and 2026's primary surface is the agent-to-agent handoff. New techniques include agent card shadowing (cloning legitimate agent skill advertisements), agent impersonation, and capability hijacking. Medium / InstaTunnel
Each link below shares sources, entities, or timing with this story.
Shared entity: Medium / Same source domain / What happened next
Both cover Medium; reported by the same outlet (medium.com); picks up the Medium thread on 2026-06-07.
Both cover Medium; reported by the same outlet (medium.com); picks up the Medium thread on 2026-03-16.
Both cover Medium; reported by the same outlet (medium.com); picks up the Medium thread on 2026-03-16.
Shared entity: Medium / Same source domain / Earlier coverage
Both cover Medium; reported by the same outlet (medium.com); earlier Medium coverage from 2026-02-27.
Both cover Medium; reported by the same outlet (medium.com); earlier Medium coverage from 2026-02-17.
Shared topic / Tension / Downstream implication
Overlapping topics (agent, direct); pushes against this story (but); traces where this leads (implication).
Overlapping topics (defin, document); pushes against this story (against); traces where this leads (which means).
Overlapping topics (agent, handoff); pushes against this story (against); traces where this leads (downstream).