Why do exposed agent gateways increase NHI risk across connected services?

Why This Matters for Security Teams

Exposed agent gateways are risky because they concentrate both access and trust. A gateway that brokers service calls for an autonomous agent often holds session state, API keys, refresh tokens, and downstream routing logic in one place. That makes it a non-human identity control point, not just an application layer. The risk is amplified when agents can chain tools, retry requests, or trigger actions across multiple connected services without human review.

NHIMG research shows how often this pattern becomes material in practice. In the Ultimate Guide to NHIs, 96% of organisations store secrets outside secrets managers in vulnerable locations, and 97% of NHIs carry excessive privileges. That combination is especially dangerous when a gateway is exposed to the internet or to broad internal trust zones. Current guidance from the NIST AI Risk Management Framework and the OWASP Agentic AI Top 10 both point toward runtime control, least privilege, and stronger identity boundaries because static trust assumptions do not hold once an agent can act autonomously.

In practice, many security teams discover gateway overreach only after one exposed token or configuration export has already opened access to several downstream systems.

How It Works in Practice

An exposed gateway becomes an NHI risk surface because it often performs three jobs at once: identity broker, policy translator, and transport layer. If any one of those layers is compromised, the attacker may inherit the gateway’s authority over connected services. For autonomous agents, that is worse than a normal app proxy because the agent may continue operating, requesting new tokens, and exploring paths a human operator would never predict.

The better model is to treat the gateway as a workload identity boundary and issue access only for the task at hand. That usually means short-lived credentials, context-aware authorization, and automatic revocation when the task ends. Security teams increasingly pair this with policy-as-code and runtime decisions rather than broad pre-approved roles. The practical objective is to verify what the agent is trying to do, which service it is trying to reach, and whether the request context still matches the approved intent.

• Use workload identity, not shared service passwords, to prove the gateway’s and agent’s cryptographic identity.
• Prefer JIT access with narrow scopes and short TTLs over durable secrets stored in gateway config.
• Evaluate policy at request time using current context, not only during deployment.
• Log token issuance, downstream target, and tool invocation so compromise paths can be reconstructed quickly.

NHIMG’s 52 NHI Breaches Analysis and the Analysis of Claude Code Security both reinforce the same operational lesson: once a gateway can mint or replay secrets for multiple services, a single point of exposure becomes a broad lateral-movement path. These controls tend to break down in high-throughput integrations where teams cache tokens for performance or allow the gateway to reuse long-lived credentials across many tenants.

Common Variations and Edge Cases

Tighter gateway controls often increase implementation overhead, requiring organisations to balance operational speed against the reduction in blast radius. That tradeoff is especially visible in multi-agent systems, where every additional tool call can trigger a new authorization check and every new service integration can require a distinct trust policy.

There is no universal standard for this yet, but current guidance suggests avoiding shared gateway accounts, static session tokens, and plaintext secret returns. Where performance requirements are strict, teams may use cached identity assertions rather than cached secrets, but that distinction has to be carefully designed and monitored. If an agent gateway must bridge internal and external services, the safest pattern is to scope each downstream grant to a single intent and revoke it immediately after use.

Edge cases matter. Browser-based operator consoles, delegated admin workflows, and legacy SaaS connectors often force gateways to handle long-lived refresh tokens or broad delegation scopes. Those environments deserve extra scrutiny because the gateway is no longer just relaying traffic, it is effectively acting as a privileged federation layer. The most common failure mode is assuming the perimeter protects the gateway, when the real risk is that the gateway itself becomes the highest-value credential store in the chain.

For deeper context, see the Top 10 NHI Issues and the OWASP NHI Top 10, which both reflect how exposed control planes and overprivileged automation multiply downstream compromise risk.

Related resources from NHI Mgmt Group

• How should teams reduce the risk from exposed NHI secrets?
• Why do non-human identities increase zero trust risk?
• Why do secrets create disproportionate risk in NHI environments?
• How should teams secure non-human identities across cloud and SaaS?