Malicious Agent-to-Agent Message Injection - ATR-2026-00116 (5730efed-405a-5c5b-9951-ab8b04c49892)
Detects malformed or malicious messages in agent-to-agent (A2A) communication channels. Attackers can embed prompt injection payloads, hidden tool calls, or credential forwarding requests inside inter-agent messages. When a receiving agent processes these messages without validation, the embedded instructions execute in the receiver's security context, potentially escalating privileges across the multi-agent system.