Why do access reviews often fail to improve identity governance?

Why This Matters for Security Teams

Access reviews are supposed to catch entitlement creep, role drift, and stale access before they become incidents. In practice, they often measure activity rather than risk: reviewers click approve because an account still exists, a manager lacks context, or the system is too noisy to challenge every line item. That is especially dangerous for non-human identities, where service accounts, API keys, and automation tokens can outlive the business process that created them.

The operational gap is visible in NHI research: NHI Mgmt Group reports that only 5.7% of organisations have full visibility into their service accounts, and 97% of NHIs carry excessive privileges in the Ultimate Guide to NHIs. When reviews are disconnected from lifecycle ownership, they can reinforce bad access rather than remove it. Current guidance from the NIST Cybersecurity Framework 2.0 and the OWASP Non-Human Identity Top 10 both point toward continual validation, not checkbox recertification.

In practice, many security teams discover access sprawl only after an audit exception, a secrets leak, or an incident forces them to trace who approved what and why.

How It Works in Practice

Effective identity governance starts by redefining the review target. The question is not simply “does this access exist?” but “is this access still needed for this identity, this workload, and this business function?” That requires asset and ownership context, a current inventory, and a review workflow that can distinguish between human users, service accounts, API keys, and other secrets. NHI lifecycle controls matter here because access review without lifecycle data is incomplete.

For NHIs, the strongest pattern is to link review outcomes to remediation: revoke unused secrets, shorten credential TTLs, remove orphaned entitlements, and require a named business owner for every persistent identity. NHI Mgmt Group’s Lifecycle Processes for Managing NHIs emphasise that governance only works when rotation, offboarding, and visibility are part of the same control loop. That aligns with the broader risk picture in the Top 10 NHI Issues, where excessive privilege and poor lifecycle hygiene are recurring failures.

• Review entitlement existence and business necessity together, not separately.
• Require evidence of workload ownership, last-use data, and expiry for each NHI.
• Route exceptions to a remediation queue, not a permanent approval status.
• Use review findings to trigger rotation, revocation, or privilege reduction.

Strong programmes also measure post-review outcomes, such as how many entitlements were removed and how many identities were reclassified as stale. These controls tend to break down when inventories are incomplete and ownership is unclear because reviewers cannot verify whether access maps to a live process.

Common Variations and Edge Cases

Tighter reviews often increase operational overhead, so organisations must balance audit depth against the speed of change. That tradeoff is real: overly aggressive recertification can slow engineering, while shallow reviews preserve invisible risk. Current guidance suggests separating persistent human access from ephemeral workload access, because the control logic is different for each.

A frequent edge case is automation that legitimately needs broad access during a narrow task window. In those cases, best practice is evolving toward just-in-time provisioning, short-lived secrets, and explicit expiration rather than recurring blanket approvals. Another common failure mode is delegated review, where managers approve technical access they cannot understand. For those environments, the review should shift to control owners, workload owners, or platform teams with the evidence to make a meaningful decision. The regulatory lens in Regulatory and Audit Perspectives is useful here because it frames reviews as a control that must produce defensible remediation, not just completion records.

Where environments rely on shared service accounts, long-lived CI/CD tokens, or third-party integrations, access reviews often become a lagging indicator because by the time a reviewer sees the entitlement, the real risk is already in the secret sprawl behind it.

Related resources from NHI Mgmt Group

• Why do privileged access programmes often fail to improve governance maturity?
• What do security teams get wrong about access reviews in identity governance?
• Why do periodic access reviews fail to reduce identity risk in real environments?
• Why do access reviews fail when identity lifecycle data is incomplete?