Beyond Prompt Injection: The Non-Human Authorization Gap in Enterprise AI

The Hidden Vulnerability in Multi-Agent Chains The biggest architectural risk in enterprise AI today isn’t prompt injection—it’s Delegation Escalation . When a human user triggers an AI Agent Orchestrator, which then delegates tasks to sub-agents and tool execution gateways via MCP or internal APIs, traditional static service accounts break down. If you pass broad bearer tokens or static user API keys down the execution chain, you create a massive Confused Deputy vulnerability. To deploy autonomous multi-agent chains safely at enterprise scale, platform architects must enforce OAuth 2.1 RFC 8693 Token Exchange with explicit actor claims. The Non-Human Authorization (NHA) Flow Human User Authorization: A user authenticates and grants a specific, bounded scope (e.g., read:finance ) to the primary Agent Orchestrator. Token Exchange: The Orchestrator leverages OAuth 2.1 Token Exchange (RFC 8693) via the enterprise identity gateway rather than passing raw user credentials downstream. Actor-Claim Scoped Call: The sub-agent or tool execution layer receives a short-lived token containing a nested actor claim ( act ) identifying both the human subject and the orchestrator, ensuring execution authority is strictly bounded by the intersection of their permissions. 3 Non-Negotiable Rules for Agentic Identity Governance Delegation Over Impersonation (RFC 8693): Never allow an agent to blindly impersonate a user. Enforce OAuth 2.1 Token Exchange so every issued JWT token contains a nested actor claim: Human Subject -> Agent Orchestrator -> Sub-Agent . Every downstream API must verify both who authorized the action and which agent executed it. Intersection of Privileges (User ∩ Agent): An agent’s runtime authority must be the strict mathematical intersection of the user’s IAM permissions and the agent’s registered tool scope. An agent should never acquire more system access than the human user who invoked it. Ephemeral Tokens & DPoP Binding: Eliminate static configuration API keys