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Attackers exploit weaknesses in the coordination protocols agents speak — chiefly MCP and A2A — to bypass consent checks, hijack a protocol transition, or corrupt shared context, turning the connective tissue of a… In a multi-agent system: A malformed MCP message mimics a legitimate protocol transition and skips the consent step a tool call should have requi…
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Insecure inter-agent protocol describes weaknesses in protocols through which agents exchange messages, identities, and permissions.
The topic grew from applying protocol and API security problems to agentic systems; OWASP treats insecure agentic communication as a distinct risk area.
Each message needs an authenticated sender, an expected recipient, an allowed operation, and verifiable consent. Handoffs are validated before a downstream agent invokes a tool or sensitive action.
Attackers exploit weaknesses in the coordination protocols agents speak — chiefly MCP and A2A — to bypass consent checks, hijack a protocol transition, or corrupt shared context, turning the connective tissue of a…
Primary mitigation: Mutual authentication and encryption on every inter-agent channel (per the A2A Protocol), protocol-payload sanitisation of context and tool metadata, Permission-scoped Tools for tightly scoped delegation, and an Audit Trail over every protocol exchange.
For practical classification of Insecure Inter-Agent Protocol Abuse, its concrete application context and the fields of Agentic AI, Risk, Security are decisive.
The risk grows across MCP, A2A, or custom agent protocols with many trust boundaries. Signatures, replay protection, capability checks, and explicit approvals should be protocol features.
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