A mediated identity used to represent an AI agent or workload when it accesses tools on behalf of a business process. It carries scoped permissions and auditability, which makes agent activity governable without exposing raw credentials.
Expanded Definition
Proxy Identity is the controlled identity layer that lets an AI agent or workload act on behalf of a business process without inheriting broad, reusable access. In NHI management, it sits between the agent’s execution context and the downstream tool, API, or data service, so the organisation can scope permissions, log actions, and revoke access independently of the agent itself. This matters because agentic systems often need to complete multi-step tasks while moving through systems that were originally designed for human users or static service accounts.
Definitions vary across vendors when proxy identity is discussed alongside delegated access, service accounts, or token exchange. NHI Management Group treats it as an operational control pattern, not a product feature. The key distinction is that the proxy identity represents intent and accountability, while the agent remains the actor using it. That separation supports least privilege, time-bounded access, and traceability across workflows, consistent with NIST Cybersecurity Framework 2.0 governance expectations.
The most common misapplication is treating a proxy identity as a shared service account, which occurs when multiple agents or teams reuse the same long-lived credential across unrelated workflows.
Examples and Use Cases
Implementing proxy identity rigorously often introduces orchestration overhead, requiring organisations to weigh tighter auditability and revocation control against additional policy design and runtime complexity.
- An AI agent opens tickets in a help desk system using a proxy identity that can only create and update records, not export customer data.
- A workflow agent calls internal APIs through a proxy identity that expires after the job completes, reducing the blast radius if the agent is compromised.
- A data-processing pipeline uses a proxy identity to access object storage during a scheduled run, while the underlying compute workload never receives standing credentials.
- An approval agent in a finance workflow acts through a proxy identity tied to a single business function, with logs preserved for post-incident review and compliance evidence. This pattern is consistent with lessons reflected in the 52 NHI Breaches Analysis and the broader guidance in the Ultimate Guide to NHIs.
- A release automation agent uses a proxy identity to deploy to production only after policy checks, with the identity revoked automatically when the deployment window ends, aligning with NIST Cybersecurity Framework 2.0 access control principles.
Why It Matters in NHI Security
Proxy identity is critical because it gives security teams a practical way to govern agentic activity without exposing raw secrets to the agent runtime. When it is absent, organisations often fall back to embedded API keys, shared tokens, or overprivileged service accounts, all of which weaken attribution and make containment harder after misuse. NHI Mgmt Group reports that Ultimate Guide to NHIs found 97% of NHIs carry excessive privileges, a signal that identity scoping remains a major control gap. Proxy identity helps reduce that exposure by separating the actor from the permission set and by enabling revocation at the right boundary.
It also supports incident response. If an agent begins behaving unexpectedly, a well-designed proxy identity can be isolated without shutting down the entire workload or rotating unrelated credentials. That is why proxy identity fits naturally with Top 10 NHI Issues and the governance priorities in NHI Management Group research. Organisations typically encounter the operational necessity of proxy identity only after an agent triggers an abuse case, at which point identity scoping and audit trails become unavoidable to address.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Proxy identities constrain agent access and reduce standing privilege exposure. |
| NIST CSF 2.0 | PR.AC-4 | Least-privilege access and identity governance map directly to proxy identity design. |
| NIST Zero Trust (SP 800-207) | SC-7 | Zero Trust requires continuous verification and narrowly scoped access paths for workloads. |
Treat proxy identity as a verified access boundary with continuous enforcement.
