How should security teams modernise identity without creating new access sprawl?

Why This Matters for Security Teams

Identity modernisation often goes wrong when teams try to make every user, service account, and automation path fit the same entitlement model. That approach creates access sprawl, not control, because the resulting exceptions pile up faster than they can be reviewed. For NHIs, the bigger risk is usually not lack of authentication but weak lifecycle governance, over-privileged access, and hidden dependencies across code, pipelines, and third-party integrations.

NHI Management Group’s Ultimate Guide to NHIs notes that 97% of NHIs carry excessive privileges and 71% are not rotated within recommended time frames, which is why identity modernisation has to start with separation, not consolidation. The OWASP Non-Human Identity Top 10 reinforces the same theme: unmanaged machine identities are a control failure, not just an inventory problem. The practical objective is to reduce hidden privilege pathways while improving visibility across distinct identity classes.

In practice, many security teams encounter access sprawl only after a privileged token, CI/CD secret, or third-party OAuth grant has already been reused beyond its original purpose.

How It Works in Practice

The safest modernisation pattern is to split identity governance into separate policy lanes for humans, workloads, and automation. Humans still need directory-backed lifecycle controls, MFA, and role governance. NHIs need workload identity, short-lived credentials, and runtime policy checks. Automation and agents need task-scoped access that expires when the job completes. That distinction matters because a service account does not behave like a person, and an AI agent may chain tools in ways that are impossible to predict upfront.

For machine identities, current guidance favours workload identity over long-lived secrets. That can mean SPIFFE/SPIRE, OIDC-based federation, or cloud-native ephemeral tokens, but the operational goal is the same: prove what the workload is at request time, then issue only the access needed for that task. NHI Management Group’s State of Non-Human Identity Security found that only 1.5 out of 10 organisations are highly confident in securing NHIs, which reflects how often these identities remain outside normal governance.

• Separate directories from policy enforcement so identity source and authorization logic are not coupled.
• Use JIT provisioning for elevated access, with automatic expiry and revocation.
• Apply policy-as-code at request time, rather than relying on static role bundles.
• Track ownership, purpose, and service boundaries for every NHI.
• Review secrets, tokens, and federated trust paths as part of the same control plane.

Zero Trust principles help, but they only work when the policy engine can distinguish human intent from machine execution and can evaluate context continuously. The NIST Zero Trust Architecture guidance supports this model by treating access as a decision made per request, not a one-time entitlement. These controls tend to break down in legacy environments where shared service accounts, embedded secrets, and tool-specific exceptions are still required for basic operations.

Common Variations and Edge Cases

Tighter identity segmentation often increases operational overhead, requiring organisations to balance reduced blast radius against integration complexity. There is no universal standard for every environment yet, especially where older applications cannot support workload federation or short-lived tokens. In those cases, best practice is evolving toward compensating controls rather than forcing an all-at-once migration.

One common edge case is third-party SaaS access through OAuth grants. Another is CI/CD tooling that still depends on static secrets stored in variables, config files, or vaults. A third is AI-enabled automation, where the access pattern changes with each task and static RBAC becomes too coarse to be safe. NHI Management Group’s 52 NHI Breaches Analysis shows how often these hidden pathways become incident drivers once credentials are reused or overlooked.

Where modernisation is partial, security teams should avoid creating a “new IAM” that simply re-labels old exceptions. Instead, they should define which identity types are eligible for federation, which require explicit JIT controls, and which must remain isolated until the application stack can support modern auth. That approach keeps the programme moving without turning modernization into a broader access sprawl problem.

Related resources from NHI Mgmt Group

• How should security teams automate identity lifecycle management without creating new access risk?
• How should security teams replace traditional MFA without creating new access friction?
• How should security teams automate database access without creating new privilege creep?
• How should security teams extend workload identity to VMs without creating secret sprawl?