Enterprises should centralise identity governance so policy, approvals, and audit controls apply consistently across both on premises and cloud environments. The practical goal is to reduce fragmentation, lower manual exception handling, and keep access decisions aligned to business roles and risk. Strong governance also improves visibility, supports compliance, and makes it easier to prove who has access and why.
Why This Matters for Security Teams
Identity governance across on premises and cloud is now a control-plane problem, not just an access-review exercise. When policy is split across directories, cloud IAM, PAM, and ad hoc exceptions, organisations lose the ability to prove who can reach critical systems and why. That gap shows up most clearly in non-human identities, where access is often over-provisioned, long lived, and poorly reviewed. NHIMG’s Ultimate Guide to NHIs notes that 97% of NHIs carry excessive privileges, which makes fragmented governance a direct risk multiplier.
Security teams also need a common language for control design. The NIST Cybersecurity Framework 2.0 and the OWASP Non-Human Identity Top 10 both point toward consistent identity governance, but they do not eliminate the operational burden of reconciling different platforms. In practice, many security teams discover the real gap only after a stale service account or cloud role is used to move laterally across environments, rather than through a planned governance review.
How It Works in Practice
Effective governance starts with one authoritative policy model, then maps that model to the enforcement points in each environment. The goal is not identical tooling everywhere, but consistent decision criteria for human and non-human access: approved purpose, business owner, risk level, time limit, and revocation path. That model should cover directories, cloud IAM, PAM, secrets managers, and service account inventory.
For enterprises with mixed estates, the operating pattern usually includes:
- Centralising identities and entitlements in a governance layer, while syncing to on premises directories and cloud providers.
- Using role design and entitlement review to reduce one-off exceptions, especially for privileged access.
- Applying joiner, mover, and leaver processes to both human users and NHIs so account lifecycle is not environment-specific.
- Requiring short-lived credentials where feasible, with strong rotation and revocation controls for secrets and API keys.
- Logging access decisions and changes in a common audit trail so reviewers can trace the approval, policy, and actual use.
This becomes more important as identity surfaces expand. NHIMG’s Lifecycle Processes for Managing NHIs section highlights that governance must include issuance, rotation, and offboarding, not just initial approval. The same design principle appears in the NIST SP 800-53 Rev. 5 Security and Privacy Controls, which ties access control, configuration management, and auditability together rather than treating them as separate activities. These controls tend to break down when legacy on premises systems cannot consume modern policy signals and cloud teams create local exceptions to keep delivery moving.
Common Variations and Edge Cases
Tighter central governance often increases administrative overhead, so organisations have to balance consistency against delivery speed. That tradeoff is especially visible in hybrid environments with legacy applications, merger-acquired directories, and third-party integrations that cannot easily support modern federation or automated provisioning.
Current guidance suggests treating these cases as exceptions with expiry dates, not permanent policy carve-outs. Where full centralisation is not realistic, the practical fallback is to standardise minimum controls: named owners, documented purpose, periodic recertification, and revocation SLAs. For NHIs, the bar should be higher because credentials can be copied, embedded, or forgotten outside normal HR-driven workflows. NHIMG’s 52 NHI Breaches Analysis shows how often identity sprawl becomes a breach pathway, while the core Key Challenges and Risks discussion reinforces that visibility is usually the first limiting factor. In environments with heavy outsourcing, multiple cloud tenants, or rapid DevOps delivery, governance breaks down when each team is allowed to define access rules independently because no single review process can see the full entitlement chain.
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 and CSA MAESTRO address the attack and risk surface, while NIST CSF 2.0, NIST SP 800-53 Rev 5 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC-1 | Centralised identity governance depends on controlled access management. |
| OWASP Non-Human Identity Top 10 | NHI-01 | Hybrid estates amplify NHI sprawl, overprivilege, and poor lifecycle control. |
| NIST SP 800-53 Rev 5 | AC-2 | Account management is the core control for consistent hybrid identity governance. |
| NIST Zero Trust (SP 800-207) | AC-4 | Zero Trust requires policy-based access decisions across segmented environments. |
| CSA MAESTRO | IAM-2 | Hybrid and cloud identity governance must handle autonomous and machine identities. |
Inventory NHIs across cloud and on premises, then enforce ownership, rotation, and revocation.
Related resources from NHI Mgmt Group
- Why do organisations struggle to govern access effectively as identity estates grow across SaaS and hybrid systems?
- Why do external vendor access workflows need stronger identity governance in hybrid cloud environments?
- How should security teams govern access across on-prem, cloud, code, and ticketing systems without creating siloed decisions?
- How should security teams govern non-human access to engineering environments in cloud and Git platforms?
