The growth of identity logic across code, services, and infrastructure instead of keeping it under a single governed control plane. This makes access harder to audit, reviews harder to trust, and revocation harder to prove, especially when humans, services, and agents share the same environment.
Expanded Definition
Runtime identity sprawl describes identity controls that accumulate across application code, service meshes, pipelines, orchestration layers, and agents instead of being governed from a consistent control plane. In NHI security, the problem is not only the number of identities, but the number of places where authentication, authorization, token handling, and revocation logic are duplicated. That duplication makes audit evidence fragmented and often inconsistent with actual runtime behaviour.
The concept aligns with how NIST Cybersecurity Framework 2.0 treats identity and access governance as an ongoing operational function rather than a one-time design task, but no single standard yet defines runtime identity sprawl as a formal control category. In practice, the issue shows up when service accounts, API keys, workload identities, and AI agent credentials are each managed differently across environments. NHI Management Group’s Ultimate Guide to NHIs frames this as a governance failure because identity state becomes distributed faster than it can be reviewed. The most common misapplication is treating every embedded credential or policy fragment as an isolated implementation detail, which occurs when platform teams optimise for deployment speed without a unified revocation model.
Examples and Use Cases
Implementing runtime identity controls rigorously often introduces coordination overhead, requiring organisations to weigh developer autonomy and release speed against auditability and revocation confidence.
- A CI/CD pipeline injects short-lived tokens at build time, but the application still stores fallback API keys in config files, creating two parallel identity paths.
- A Kubernetes workload uses one service account in the cluster manifest, another in the secret store, and a third in the application code, making it unclear which identity is actually active.
- An AI agent receives tool access through MCP, while adjacent services enforce separate authorization rules, so privilege changes must be edited in multiple systems.
- Teams move from a central vault to local environment variables, then to temporary scripts and chatops commands, expanding the runtime attack surface documented in Top 10 NHI Issues.
- When architecture reviews rely on diagrams but not live identity telemetry, the resulting control picture can diverge from the actual runtime state described in NIST Cybersecurity Framework 2.0.
Why It Matters in NHI Security
Runtime identity sprawl matters because every duplicated identity path increases the chance that access persists after the original business need has ended. NHIMG research shows NHIs now outnumber human identities by 144:1 in enterprise environments, driven by AI agents, CI/CD automation, and third-party integrations, which means any lack of runtime governance scales very quickly. When identity logic is scattered, offboarding becomes partial, rotation becomes uneven, and privilege reviews become performative instead of evidence-based.
This is especially dangerous in breach response. The 52 NHI Breaches Analysis and the Ultimate Guide to NHIs — Key Challenges and Risks both reinforce that attackers exploit weak visibility, stale credentials, and excessive privilege once identities are no longer centrally governed. Organizations typically encounter the consequences only after a leaked token, failed audit, or lateral movement incident, at which point runtime identity sprawl 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 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 | Covers NHI lifecycle and governance gaps that runtime identity sprawl creates. |
| NIST CSF 2.0 | PR.AC-1 | Identity and access controls require consistent enforcement across runtime environments. |
| NIST Zero Trust (SP 800-207) | AC-4 | Zero Trust requires policy enforcement at each access decision, not scattered identity logic. |
Centralise runtime identity issuance and revocation so every workload follows one governed lifecycle.
