Should organisations rely on periodic access reviews for privileged accounts?

Why This Matters for Security Teams

Periodic access reviews still matter, but they are a weak primary control when privileged access changes faster than the review cadence. The problem is not the review itself; it is the time gap between a change in privilege and the next attestation cycle. NHI Mgmt Group notes that only 5.7% of organisations have full visibility into their service accounts, which means many teams are certifying an inventory that is already stale. See the Ultimate Guide to NHIs and the OWASP Non-Human Identity Top 10 for the underlying risk patterns.

For privileged accounts, especially service accounts, API keys, and automation identities, the risk is privilege drift: access expands, tokens proliferate, and ownership becomes unclear long before the next quarterly or semiannual review. Current guidance suggests treating reviews as a governance backstop, not as a detection mechanism. That matters because excessive privilege is rarely visible in a spreadsheet, but it is immediately exploitable in production.

In practice, many security teams encounter over-privilege only after a secrets leak, lateral movement event, or failed offboarding has already occurred, rather than through intentional review alone.

How It Works in Practice

Effective programmes combine periodic certification with continuous discovery so that the review reflects current state, not last quarter’s state. The operational goal is to maintain an up-to-date privileged inventory, then validate it against ownership, business need, and actual usage. That is consistent with the lifecycle emphasis in the NHI Lifecycle Management Guide and aligns with the control intent in the OWASP Non-Human Identity Top 10.

A practical workflow usually includes:

• continuous discovery of service accounts, API keys, tokens, and certificates across cloud, CI/CD, and vaults;
• mapping each privileged account to an owner, system, and business purpose;
• usage-based signals that show whether the account is active, dormant, or mis-scoped;
• scheduled review only after the inventory is normalised and exceptions are flagged;
• automatic revocation or step-up control when no owner, no purpose, or no recent use can be confirmed.

Periodic review is still useful for segregation-of-duties checks and audit evidence, but the control should be paired with alerts for new privilege grants, role changes, vault exposure, and stale credentials. The strongest programmes also tie review outcomes to remediation SLAs so “approved” does not mean “left in place indefinitely.” NHI Mgmt Group research shows that 97% of NHIs carry excessive privileges, which is why review-only programmes tend to underperform when identities outnumber humans at enterprise scale.

These controls tend to break down in fast-moving CI/CD and ephemeral cloud environments because access can be created, reused, and forgotten faster than the review cycle can detect it.

Common Variations and Edge Cases

Tighter review cycles often increase operational overhead, requiring organisations to balance assurance against reviewer fatigue and change velocity. There is no universal standard for how often privileged access must be re-certified; current guidance suggests setting frequency by risk, blast radius, and how quickly access can be created or revoked. Low-risk administrative access may tolerate periodic review, while production deployment credentials and break-glass accounts often need much shorter control loops.

One common edge case is ephemeral infrastructure. Short-lived workloads, temporary contractors, and automated pipelines may generate valid privileged access that is already gone by the time reviewers see it. In those environments, the better control is not longer review forms, but stronger workload identity, short TTLs, and near-real-time policy checks. Another edge case is shared administrator accounts, where attestation can confirm that “someone” needs the account but not which person used it, making accountability weak even if the review passes.

Periodic access reviews therefore work best when paired with Ultimate Guide to NHIs — Key Challenges and Risks and when exceptions are treated as risk decisions, not administrative noise.

Related resources from NHI Mgmt Group

• What breaks when organisations rely on periodic access reviews for AI systems?
• Who should own access reviews for privileged REST endpoints?
• What breaks when Office 365 identity reviews rely only on periodic certification?
• Why do runtime identity controls matter more than periodic access reviews?