How do access reviews support zero standing privilege and just-in-time access?

Access reviews support zero standing privilege when they focus on exceptions rather than persistent access. Just-in-time access should be temporary by design, while certification should confirm why any entitlement remains outside that model. When those controls are aligned, review becomes a cleanup mechanism for access that should not stay in place.

Why This Matters for Security Teams

Access reviews are often treated as a compliance ritual, but for zero standing privilege they should function as a control on exceptions. If JIT access is working correctly, most entitlements should disappear on their own, leaving reviewers to explain the few that remain. That is why access certification and JIT are tightly linked in NHI governance: one creates temporary access, the other checks whether anything escaped the temporary model.

This is especially important for non-human identities because persistent access accumulates quickly across service accounts, pipelines, and integrations. NHI Mgmt Group notes that NHIs outnumber human identities by 25x to 50x in modern enterprises, and that 97% carry excessive privileges in many environments, which means reviews are not just administrative cleanup. They are one of the few practical ways to surface privilege that has become normalised over time. See the Ultimate Guide to NHIs for the broader lifecycle context, and the OWASP Non-Human Identity Top 10 for the associated risk patterns.

In practice, many security teams discover overprivileged access only after a service account has already been reused across environments or left exempt from normal expiry rules.

How It Works in Practice

The most effective model is simple: JIT grants narrow, time-bound access for a defined task, and access reviews verify that anything outside that pattern has a documented reason to stay. The review is not trying to prove every entitlement is justified forever. It is checking whether standing access still has a valid operational need, whether the approval chain is current, and whether the entitlement should be converted into a temporary workflow instead.

For NHI programs, that usually means combining privileged access management with entitlement inventory, ownership metadata, and expiry enforcement. A reviewer should be able to see who owns the identity, what it is used for, what systems it can reach, and whether the access is tied to a workload, release window, or operational exception. Where possible, access reviews should pull from authoritative sources such as asset inventory, ticketing, or policy-as-code rules rather than manual spreadsheets. NHI Mgmt Group’s NHI Lifecycle Management Guide is useful here because access review only works when lifecycle state, rotation, and offboarding are visible.

• Use JIT for privileged operations that do not need permanent reach.
• Set expiry on secrets, tokens, and role assignments by default.
• Review only exceptions that persist beyond the approved time window.
• Require named owners and business justification for every standing entitlement.
• Remove access automatically when the task, deployment, or incident is closed.

Best practice is evolving toward continuous review, where entitlements are checked against runtime context and workload identity, not just periodic certification cycles. That aligns with guidance from the OWASP Non-Human Identity Top 10 and the broader control intent in Zero Trust models. These controls tend to break down when identities are shared across teams or embedded in legacy automation, because no single owner can attest to the access with confidence.

Common Variations and Edge Cases

Tighter review cycles often increase operational overhead, requiring organisations to balance reduced privilege sprawl against release friction and approval latency. That tradeoff is real, especially where JIT cannot be used for every task.

Shared service accounts, emergency access, and third-party integrations are the hardest cases. Shared accounts often lack a clear reviewer, so certification becomes a search for accountability rather than a meaningful access decision. Emergency access may legitimately bypass normal JIT flow, but current guidance suggests it should still be time-boxed, logged, and reviewed after the fact. Third-party or vendor-managed identities can also remain outside normal workflows, which is why exception handling must be explicit rather than implied. NHI Mgmt Group’s analysis shows that 92% of organisations expose NHIs to third parties, making this a common source of standing access risk in real environments; the broader evidence is summarised in the Ultimate Guide to NHIs — Key Challenges and Risks.

The practical rule is to treat access reviews as a cleanup mechanism for anything that could not be made temporary. If a team cannot explain why an entitlement is still standing, it is usually a sign that the access should be redesigned, not re-certified indefinitely.

Related resources from NHI Mgmt Group

• When do NHI access reviews create more value than a one-time cleanup?
• What is the difference between zero standing privilege and just-in-time access?
• What is the difference between just-in-time access and zero standing privilege?
• Who is accountable when zero-trust controls fail to reduce access over time?