Access reviews and least privilege are only effective when recurring

At a glance

What this is: This is a governance analysis of why recurring access reviews are essential to keep least privilege from eroding across users, contractors, service accounts, and administrators.

Why it matters: It matters because IAM programmes that stop at onboarding leave stale permissions in place, increasing compliance risk, insider exposure, and audit failure across human and non-human access.

By the numbers:

• Only 44% of organisations have implemented any policies to manage their AI agents, despite 92% agreeing that governing AI agents is critical to enterprise security.
• Systems with least-privileged AI access had a 17% incident rate vs 76% for over-privileged systems.

👉 Read SecurEnds's analysis of access reviews and least privilege governance

Context

Least privilege is the idea that an identity should only hold the permissions needed to do a specific job. In practice, that principle breaks down when access is granted once and never revalidated, because employees change roles, temporary exceptions linger, and service accounts accumulate permissions across systems.

This article is really about the gap between policy and enforcement in IAM and identity governance. Access reviews exist to close that gap by certifying whether access still has a business need, but many organisations still treat them as a compliance task rather than the control that keeps privilege from creeping outward.

For NHI programmes, the same pattern applies to service accounts, API keys, and shared automation identities. If access is not continuously reviewed, non-human identities can become hidden privileged pathways long after the original business justification has expired.

Key questions

Q: How should security teams implement access reviews to enforce least privilege?

A: Security teams should build access reviews around current business need, complete entitlement inventory, and enforced remediation. The review must cover both human and non-human identities where they hold access, and every revoke decision must be verified in the target system. Otherwise, certification records create compliance evidence without actually reducing privilege.

Q: Why do access reviews matter more than one-time access cleanup?

A: One-time cleanup reduces noise temporarily, but it does not stop privilege from accumulating again as people change roles, projects, or systems. Access reviews matter because they repeat the decision, create audit evidence, and force revocation to happen on an ongoing basis. That is what keeps least privilege from decaying into privilege creep.

Q: What breaks when organisations skip recurring access certification?

A: When recurring certification is missing, stale access stays active, temporary permissions become permanent, and dormant accounts keep their original entitlements. The result is an environment where reviewers no longer know who truly needs what, and attackers or insiders can exploit excess access that should have been removed long ago.

Q: Who is accountable when unnecessary access remains in place?

A: Accountability usually sits with multiple parties: managers or application owners for access decisions, IAM or IGA teams for workflow design, and control owners for proving that revocation occurred. In regulated environments, the organisation remains accountable for showing that least privilege is continuously enforced, not merely documented.

Technical breakdown

How access review workflows validate least privilege

Access reviews, also called access certifications, are structured governance cycles that compare current entitlements with current business need. Reviewers such as managers, application owners, or control teams validate whether each permission should remain, be narrowed, or be revoked. Effective programmes rely on complete entitlement inventories, reviewer assignment rules, escalation paths, and remediation tracking so that approval is not mistaken for enforcement. The real technical value is not the questionnaire itself but the linkage between identity data, application entitlements, and revocation workflows.

Practical implication: tie every certification outcome to a verified remediation step, not just a review record.

Why privilege creep appears across human and machine identities

Privilege creep happens when access accumulates faster than governance can remove it. For human users, that often follows role changes, projects, and temporary elevated access. For NHI, it appears as service accounts, tokens, and shared credentials that retain broad permissions after systems or owners change. The control failure is the same: lifecycle events do not trigger entitlement re-evaluation. Zero Trust and least privilege both depend on the assumption that access can be continuously narrowed as context changes, but unmanaged accumulation defeats that assumption.

Practical implication: connect joiner-mover-leaver events and NHI ownership changes to entitlement recertification.

How automated certification reduces audit gaps

Manual spreadsheet reviews create inconsistent evidence, slow revocation, and incomplete visibility across cloud, SaaS, databases, and privileged accounts. Automated certification workflows improve scale by grouping entitlements, prioritising high-risk access, routing decisions to the right reviewer, and logging revocation completion. The important mechanism is traceability: who approved what, why, when, and whether the permission was actually removed. Without that chain, access review becomes a documentation exercise instead of a governance control.

Practical implication: use centralized certification workflows that prove revocation, not just reviewer sign-off.

NHI Mgmt Group analysis

Least privilege fails first as a governance discipline, not as a policy statement. The article’s core point is that organisations often define access correctly at onboarding and then allow reality to drift. That drift is visible in humans, contractors, service accounts, and administrators alike. The practitioner lesson is that least privilege only exists when entitlement state is continuously revalidated against current work.

Access review is the control that converts least privilege from intent into evidence. A policy without recurring certification cannot prove that permissions still match business need. That is why access reviews, recertifications, and remediation tracking belong inside identity governance rather than being treated as audit aftercare. The practitioner implication is to treat certification as an operating control, not a periodic paperwork task.

Privilege creep is the named failure mode this article exposes. Temporary access becomes permanent, old roles survive transfers, and privileged permissions outlive the task that justified them. That pattern is especially damaging in hybrid estates where cloud, SaaS, and legacy systems each carry their own entitlement history. The practitioner conclusion is simple: without lifecycle-linked review, access accumulates faster than humans can notice it.

Zero Trust depends on access being revisable at runtime, not frozen by historical approval. Least privilege and zero trust share the same assumption that access can be narrowed as context changes. When organisations let entitlements age indefinitely, they break that assumption and turn trust into residue. The practitioner implication is to align recertification cadence with business change, not calendar convenience.

Identity governance must cover NHI and human access with the same lifecycle logic. Service accounts, shared credentials, and API tokens do not become safer because they are non-human. They become riskier when no one owns their review cycle, no one validates their necessity, and no one tracks removal. The practitioner conclusion is to govern machine identity with the same rigor applied to human entitlements, while adapting the evidence model to the actor type.

From our research:

• Only 44% of organisations have implemented any policies to manage their AI agents, despite 92% agreeing that governing AI agents is critical to enterprise security, according to The 2026 Infrastructure Identity Survey.
• A separate finding from the same survey shows that systems with least-privileged AI access had a 17% incident rate versus 76% for over-privileged systems.
• That gap points to the next governance move, which is to pair access review with lifecycle oversight in the Ultimate Guide to NHIs , Lifecycle Processes for Managing NHIs.

What this signals

Least privilege is becoming a lifecycle problem, not a static access problem. As environments spread across SaaS, cloud, and shared automation, the review question shifts from who approved access to who is still responsible for its removal. Teams that only measure certification completion will miss the more important indicator, which is whether revoked permissions are actually disappearing from target systems.

With 70% of organisations granting AI systems more access than they would give a human employee doing the same job, per The 2026 Infrastructure Identity Survey, the next access review cycle will increasingly need to account for non-human entitlements alongside human ones. That changes programme design, reviewer workload, and the evidence model for audit.

Privilege creep debt: every exception, transfer, and temporary entitlement that is not re-certified becomes governance debt. The organisations that manage this best will treat access review as a continuous control loop, not a calendar event, and will align it with identity lifecycle events across both people and machine identities.

For practitioners

• Prioritise high-risk access first Start certification cycles with privileged accounts, sensitive applications, and systems that can move money, expose data, or change infrastructure. That gives reviewers a smaller, more consequential queue and reduces the chance that critical entitlements are buried in low-value access lists.
• Link recertification to lifecycle events Trigger access reviews after promotions, transfers, terminations, vendor changes, and system migrations instead of relying only on quarterly or annual cycles. For service accounts and other NHIs, trigger the same review when ownership, purpose, or connected application changes.
• Track revocation to completion Do not close a certification campaign when someone clicks approve or revoke. Confirm that the permission was actually removed from each connected application, cloud platform, or directory, and retain the revocation record as audit evidence.
• Group entitlements by role or business function Use role-based grouping to collapse large entitlement sets into reviewable clusters, then escalate outliers such as shared accounts, dormant access, or conflicting privileges for separate approval.
• Measure review quality, not just completion Track revocation rates, reviewer response time, overdue certifications, and the proportion of access removed after review. Low completion with little remediation often means the programme is documenting access rather than governing it.

Key takeaways

• Least privilege fails when access is granted once but never revalidated as roles, systems, and responsibilities change.
• Recurring access reviews create the evidence, remediation, and accountability needed to keep privilege creep under control.
• IAM programmes should link certification to lifecycle events and revocation verification if they want governance to survive scale.

Key terms

• Access Certification: Access certification is the formal process of checking whether an identity still needs its assigned permissions. It turns access review into an accountable decision cycle, usually involving managers, application owners, or control teams, and it only has security value when revocations are actually enforced in connected systems.
• Least Privilege: Least privilege is the principle that an identity should hold only the access required to complete a specific task. In practice, it is not a one-time permission model but a living governance state that must be revalidated as roles, systems, and business needs change.
• Privilege Creep: Privilege creep is the gradual accumulation of unnecessary access over time. It happens when old permissions are not removed after role changes, temporary exceptions, or system migrations, leaving identities with more reach than their current work justifies.
• Non-Human Identity: A non-human identity is any machine- or workload-based account used to authenticate and authorise software, services, automation, or AI systems. These identities can carry the same governance risk as human accounts, but they often lack clear owners, review cadence, and lifecycle controls.

Deepen your knowledge

NHI governance, agentic AI identity, and machine identity security are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are responsible for identity security strategy or NHI governance in your organisation, it is worth exploring.

This post draws on content published by SecurEnds: access reviews and least privilege governance. Read the original.