Dynamic User Mode is an execution pattern where an AI agent runs under the identity of the person who invokes it. That means the agent inherits the caller’s roles and permissions at runtime, which can simplify delegation but also widen access if the caller has broad privileges.
Expanded Definition
Dynamic User Mode is an execution pattern in which an AI agent operates under the invoking person’s identity and inherits that caller’s permissions at runtime. In NHI security, that makes the agent a temporary extension of a human principal rather than a separately governed service identity. The pattern can reduce friction for delegation, but it also collapses the boundary between human access and autonomous execution, which is why it must be treated as an access-control design choice, not just a convenience feature. Definitions vary across vendors, but the security question is consistent: does the agent act with the caller’s rights, or with explicitly bounded entitlements?
This concept is closely related to least privilege, delegated authorization, and session-scoped controls in NIST Cybersecurity Framework 2.0, but it is not the same as granting a service account static access. Dynamic User Mode should be evaluated against where authority comes from, how long it persists, and whether the agent can chain actions beyond the user’s intent. The most common misapplication is treating inherited human permissions as safe by default, which occurs when organisations enable agent execution without re-checking sensitive operations against the caller’s full effective access.
Examples and Use Cases
Implementing Dynamic User Mode rigorously often introduces governance friction, because teams must balance user convenience against tighter runtime checks, approval boundaries, and auditability.
- An employee asks an AI agent to summarise and route emails, and the agent can only access the same mailbox folders the employee already has.
- A procurement assistant agent drafts purchase orders using the requester’s role, but high-value approvals still require explicit human sign-off.
- A security analyst uses an agent to query logs and open tickets under the analyst’s identity, with actions recorded as delegated activity rather than shared automation.
- An engineering lead invokes an agent to update deployment settings, but the agent cannot escalate into environment-wide admin functions that the lead also happens to hold.
Used well, this pattern can preserve accountability while reducing duplicate account provisioning. Used poorly, it can silently expand what an agent can reach, especially when the invoking user has broad privileges or inherited group memberships. NHI Management Group notes in the Ultimate Guide to NHIs that 97% of NHIs carry excessive privileges, which is a useful warning sign when dynamic delegation is built on top of over-permissioned identities.
Why It Matters in NHI Security
Dynamic User Mode matters because it changes the blast radius of human permissions. If the caller has overbroad access, the agent immediately inherits that risk and can execute actions faster, at larger scale, and with fewer natural pauses than a human would. That makes consent, audit trails, and step-up controls central to governance. It also means organisations should treat the agent as an execution path that can expose secrets, move data, or trigger privileged changes if the underlying user context is not tightly controlled. The design is especially risky where role design is already weak or where privileged access is not segmented by task.
This concern is amplified by broader NHI conditions reported by NHI Management Group, including the fact that only 5.7% of organisations have full visibility into their service accounts and that 80% of identity breaches involved compromised non-human identities such as service accounts and API keys in the Ultimate Guide to NHIs. Dynamic User Mode should therefore be paired with explicit policy checks, scoped tool access, and strong logging, not assumed safe because the identity is human-originated. Organisations typically encounter the real hazard only after an agent uses a valid user session to perform an unintended privileged action, at which point Dynamic User Mode becomes operationally 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 Agentic AI Top 10 and OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0, NIST Zero Trust (SP 800-207) and NIST SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Agentic AI Top 10 | AC-3 | Agent actions must be constrained to approved runtime authority and delegated scopes. |
| OWASP Non-Human Identity Top 10 | NHI-03 | Dynamic inheritance can expose overprivileged identities and weak session boundaries. |
| NIST CSF 2.0 | PR.AA | Identity and access management governs who may act and under what conditions. |
| NIST Zero Trust (SP 800-207) | SC-DA | Zero Trust requires continuous verification rather than trusting inherited identity context. |
| NIST SP 800-63 | Identity proofing and authenticator strength affect the trustworthiness of the invoking user. |
Limit agent tool use to the user's intended tasks and block privilege expansion beyond explicit delegation.
Related resources from NHI Mgmt Group
- What is the difference between dynamic RBAC and manual user access reviews?
- What breaks when dynamic OAuth credentials are not bound to the authenticated user in enterprise automation platforms?
- What is the difference between static and dynamic credentials?
- How do I migrate from static credentials to dynamic credentials?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on August 27, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
