Why do organisations need IAM when systems and identities keep multiplying?

Why This Matters for Security Teams

Identity sprawl is not just an administration problem; it is a control problem. As users, workloads, service accounts, APIs, and automation multiply, manual approvals and spreadsheet-driven reviews stop keeping pace with real access paths. NIST’s NIST SP 800-53 Rev 5 Security and Privacy Controls treats identity, access enforcement, and accountability as core security functions because unmanaged access quickly becomes an audit and breach issue.

NHIMG research shows the scale of the problem plainly: in Ultimate Guide to NHIs, 96% of organisations store secrets outside secrets managers in vulnerable locations, and 80% of identity breaches involved compromised non-human identities such as service accounts and API keys. That means the real risk is not simply “too many identities,” but too many identities with inconsistent lifecycle control, weak rotation, and unclear ownership.

Security teams need IAM because it creates a single operational model for authentication, authorization, and deprovisioning across people and machines. Without that model, identity drift becomes normal: access accumulates, old credentials persist, and teams lose confidence in who can do what. In practice, many security teams encounter the failure only after a leaked key, a stale service account, or a third-party integration has already been used to move laterally.

How It Works in Practice

Modern IAM reduces complexity by making identity decisions consistent across systems, even when the underlying identity types differ. For human users, that usually means federated sign-in, MFA, role assignment, and joiner-mover-leaver workflows. For machine identities, it should extend to workload identity, short-lived tokens, secret rotation, and tightly scoped service permissions rather than long-lived static credentials.

That distinction matters because workloads do not behave like employees. A service account, CI/CD job, or API client may need access only for a few minutes and only to a narrow set of resources. Current guidance from NIST and the broader zero-trust community is to prefer least privilege, continuous verification, and explicit lifecycle controls over implicit trust. NHIMG’s 2024 Non-Human Identity Security Report found that 88.5% of organisations say their non-human IAM lags behind or merely matches human IAM, which is a strong signal that machine identity governance is still catching up.

• Use centralized identity proofing and federation for human access.
• Issue short-lived credentials for workloads instead of durable secrets where possible.
• Bind permissions to workload identity and context, not just a static role name.
• Rotate and revoke keys automatically when a service, pipeline, or integration is retired.
• Log authentication, authorization, and privilege changes so auditors can reconstruct access paths.

For implementation, security teams often combine IAM with PAM, secrets management, and policy engines so access is granted only when needed and revoked when the task ends. Frameworks like Azure Key Vault privilege escalation exposure and other NHIMG research on exposed credentials show why secrets handling cannot be separated from IAM. These controls tend to break down when legacy applications require embedded credentials because the system cannot issue or consume short-lived identities cleanly.

Common Variations and Edge Cases

Tighter IAM often increases operational overhead, requiring organisations to balance stronger access control against integration complexity and user friction. That tradeoff becomes more visible in hybrid estates, third-party SaaS, and machine-to-machine integrations where identity boundaries are less uniform than in a single cloud or a single directory.

There is no universal standard for every machine-identity pattern yet. Best practice is evolving around workload identity federation, ephemeral tokens, and policy-as-code, but many environments still depend on long-lived API keys or shared service accounts. NHIMG research on JetBrains GitHub plugin token exposure and Hard-Coded Secrets in VSCode Extensions illustrates the edge case where tools themselves become identity risk amplifiers, not just consumers of identity controls.

Another common exception is emergency access. Incident response teams may need temporary elevated privileges, but those grants should still be time-bound, logged, and reviewed after use. The same applies to acquisition environments, regulated sectors, and OT-connected systems where identity modernization is slower and controls must coexist with brittle legacy components. In those cases, IAM should be phased in with compensating controls rather than assumed to be fully uniform on day one.

For mature programmes, the question is no longer whether IAM is needed. It is how quickly identity governance can keep pace with the volume, speed, and diversity of access paths before exposure becomes routine.

Related resources from NHI Mgmt Group

• Which IAM control matters most when organisations need to keep access available during identity provider outages?
• How can organisations reduce the blast radius of compromised agent identities?
• What do organisations get wrong about protecting personal data inside ERP systems?
• Why do access certifications become a control gap when identities move across jobs, systems, and cloud platforms?