How should organisations implement identity and access management across multiple applications and user groups?

Why This Matters for Security Teams

identity and access management becomes harder as organisations add more applications, more user groups, and more exceptions. The goal is not just fewer passwords, but consistent control over who can reach what, from where, and under which conditions. That matters because identity is now the primary enforcement layer for both workforce access and application access, and drift across systems quickly turns into audit gaps, overprovisioning, and avoidable risk.

Practitioners often underestimate how quickly “centralised IAM” fragments in real environments. A clean directory and single sign-on flow can still leave access decisions scattered across SaaS apps, legacy systems, and local admin paths. The NIST Cybersecurity Framework 2.0 treats identity governance as part of broader risk management, while NHIMG research shows that visibility gaps remain common even in mature programs. In the Ultimate Guide to NHIs, only 5.7% of organisations reported full visibility into their service accounts, which is a warning sign for any IAM program trying to scale across human and non-human users alike.

In practice, many security teams discover the weak points only after an application owner grants local access outside the main IAM process.

How It Works in Practice

Effective IAM across multiple applications and user groups starts with a single source of truth for identity, then extends that identity into standardised authentication, authorization, and lifecycle processes. SSO reduces password sprawl, but it is the governance layer that keeps access consistent. MFA strengthens account verification, while profile management and automated deprovisioning keep accounts current when people change roles or leave.

For most organisations, the practical sequence is:

• Centralise identities in a directory or identity provider, then synchronise trusted attributes such as department, role, and location.
• Use SSO where possible so users authenticate once and access approved apps through the same control plane.
• Apply MFA based on risk, sensitivity, and access path, especially for admin, remote, and high-value applications.
• Map access to groups and roles, but review those groups regularly so RBAC does not become permission sprawl.
• Automate joiner, mover, and leaver workflows so access changes follow business events rather than manual tickets.

The control objective is least privilege with auditable consistency. The OWASP Non-Human Identity Top 10 is useful here because the same governance failures that affect application identities often appear in user access paths too: stale credentials, excess privilege, and poor lifecycle control. NHIMG’s Top 10 NHI Issues also highlights how quickly unmanaged identities become a scaling problem when access is not tied to a clear owner and expiration policy.

These controls tend to break down in hybrid environments with legacy applications, local admin accounts, and teams that bypass the identity platform for urgent exceptions.

Common Variations and Edge Cases

Tighter centralisation often increases operational overhead, requiring organisations to balance standardisation against application-specific constraints. That tradeoff is especially visible when older systems cannot support SSO, SCIM, or modern federation protocols. In those cases, current guidance suggests compensating controls such as strong local account governance, password vaulting, logging, and periodic access recertification rather than treating the legacy app as an exception forever.

There is no universal standard for every app pattern yet, so best practice is evolving. Some business units need separate access groups for contractors, partners, and privileged operators because their review cadence, approval model, and MFA requirements differ. For high-risk access, alignment with NIST SP 800-53 Rev 5 Security and Privacy Controls helps translate policy into enforceable safeguards, while NHIMG’s Regulatory and Audit Perspectives section is a useful reminder that auditors will ask who approved access, when it was last reviewed, and how quickly it is revoked.

Where organisations have many acquisitions, multiple directories, or fragmented cloud estates, the cleanest IAM design is often phased rather than fully “big bang.” In those environments, access governance fails most often when ownership of old accounts is unclear and nobody can prove whether an entitlement is still justified.

Related resources from NHI Mgmt Group

• How should organisations implement NIS-2 controls across identity and access management?
• How should identity teams handle access decisions when user attributes are split across multiple systems?
• How should security teams evaluate identity providers for federated access across multiple applications?
• How should healthcare organisations improve identity and access management for frontline and clinical users across shared devices and mobile workflows?