TL;DR: Recurring access reviews are what keeps least privilege from decaying into privilege creep, because access typically expands across roles, systems, and temporary exceptions over time, according to SecurEnds. The governance problem is not initial provisioning but continuous validation, remediation, and evidence that permissions still match current business need.
At a glance
What this is: This is an analysis of why recurring access reviews are the control that keeps least privilege from drifting into privilege creep as permissions expand across roles and systems.
Why it matters: It matters because IAM, IGA, PAM, and NHI programmes all fail when access is provisioned once but never revalidated as responsibilities, ownership, and risk change.
Context
Least privilege is a governance model, not a provisioning event. The core problem is that access that made sense on day one often becomes excessive as users move roles, contractors leave, service accounts accumulate permissions, or administrators keep elevated rights after a project ends.
Recurring access reviews exist to close that gap by revalidating current business need against actual entitlements. In identity programmes, the failure is rarely initial approval alone. It is the absence of continuous certification, remediation, and audit evidence that keeps permission sprawl invisible until it becomes a compliance or security issue.
For NHI governance, the same pattern appears in service accounts, shared accounts, and other non-human identities that remain over-privileged long after the workflow that justified them has changed.
Key questions
Q: What breaks when access reviews are only run on a fixed schedule?
A: Fixed-cycle reviews encourage repetition, not judgment. Reviewers see the same access over and over, approve it because it looks familiar, and miss the changes that actually matter. Risk-based reviews tied to role change, privilege growth, and inactivity are far more effective than calendar compliance.
Q: Why do stale permissions create security risk even after onboarding was approved?
A: Because onboarding only proves access was justified once, not that it is still justified now. When users change roles, finish projects, or leave teams, old permissions can become excessive and exploitable. That is why recurring validation matters more than the original approval record.
Q: How do organisations know whether access reviews are working?
A: Access reviews are working when they lead to timely removals, reduced exception volume, and role definitions that stop accumulating unused rights. If the same accounts keep reappearing with the same excess access, the review process is only producing paperwork. Evidence of change is the real success signal.
Q: What is the difference between least privilege and access review?
A: Least privilege is the design principle that limits access to what is required, while access review is the governance activity that checks whether current access still matches that principle. You need both. One sets the target state, the other detects entitlement drift and exception creep.
Technical breakdown
Why permissions drift beyond their original purpose
Least privilege depends on the assumption that access granted at onboarding still matches present-day work. In practice, that assumption breaks because organisations layer temporary exceptions, project access, shared roles, and administrative shortcuts on top of baseline entitlements. Over time, permissions accumulate across applications, cloud platforms, and business systems, creating a state where the access model reflects history rather than necessity. Recurring access reviews turn this into a governed process by rechecking entitlement validity against current role and ownership data. That is what distinguishes least privilege as an operating model from least privilege as a policy statement.
Practical implication: treat entitlement drift as a lifecycle control problem, not a one-time approval problem.
How access reviews enforce least privilege in practice
Access reviews are certification cycles that ask reviewers to confirm whether each permission still has a legitimate business purpose. Managers validate employee access, application owners validate system access, and security or compliance teams collect evidence and flag risky entitlements. The technical value is not the review itself, but the remediation chain that follows approval or revocation decisions. If revoked rights are not actually removed from connected systems, the control fails operationally. This is why automated certification workflows matter: they centralise entitlement collection, support reviewer routing, and close the loop on revocation completion.
Practical implication: measure the time from certification decision to actual entitlement removal, not just completion of the review campaign.
Why recurring certification is the control that prevents privilege creep
Privilege creep is the condition where access slowly expands faster than governance can correct it. It often shows up in recurring patterns such as employees retaining old department roles, privileged permissions that outlive the original project, dormant accounts that remain active, and shared service accounts with unclear ownership. Recurring certification works because it repeatedly resets the access baseline against current need. Without that loop, every exception becomes durable, and the identity estate drifts away from the least-privilege principle. In zero trust terms, continuous validation is what keeps trust from becoming permanent by default.
Practical implication: prioritise recurring review cycles for privileged and dormant access before expanding reviews to lower-risk entitlements.
Threat narrative
Attacker objective: Exploit stale or excessive permissions to reach systems, data, or transactions that current business need should not allow.
- Initial access occurs when users, contractors, service accounts, or administrators receive more permissions than their current job requires.
- Privilege then accumulates through role changes, temporary exceptions, and project-based elevation that is never fully revoked.
- The over-privileged account becomes the escalation path, enabling unauthorized transactions, lateral movement, or broader data exposure.
- Impact follows when dormant or excessive access is exploited, audited, or discovered during a compliance failure.
Breaches seen in the wild
- Azure Key Vault Contributor escalation 2024: Datadog found Azure Key Vault Contributor could add itself to access policies and read every secret, key and certificate in a vault.
- Cisco Active Directory credentials leak 2025: Kraken leaked Cisco Active Directory hashes, including service and krbtgt accounts; Cisco says they came from its 2022 breach, not a new one.
Read our 52 NHI Breaches Analysis report for a comprehensive view of breaches impacting Non-Human Identities including AI Agents.
NHI Mgmt Group analysis
Least privilege is not a provisioning control, it is a recertification control. The article’s central point is that access assigned at onboarding decays as roles, projects, and ownership change. That makes recurring validation the real control plane for least privilege, not the original approval record. The implication is that access governance must be measured by how well it catches drift, not by how clean the joiner process looked.
Privilege creep is an identity lifecycle failure, not just a review backlog. Temporary elevation, transferred employees, dormant accounts, and shared service accounts all create the same pattern: access survives longer than accountability. That aligns with OWASP-NHI, NIST-CSF, and IAM governance thinking even when the subject is human access. Practitioners need to see the lifecycle problem before they can understand the review problem.
Recurring certification exposes the difference between policy and evidence. A policy can say least privilege is enforced, but only repeated access reviews prove that outdated entitlements are being removed across systems. That is why automated review workflows matter in mature IGA programmes. The practical conclusion is simple: if revocation completion is not tracked, least privilege is only aspirational.
Access review maturity now spans human and non-human identity governance. The same pattern that leaves employees over-permissioned also leaves service accounts and other NHIs with unnecessary standing access. That makes recurring certification a shared discipline across IAM, IGA, PAM, and NHI programmes rather than a human-only control. The implication is that identity teams should standardise review logic across identity types where business ownership exists.
Identity blast radius is determined by how long excessive access remains unchallenged. The longer permissions sit outside current need, the more likely they are to support insider misuse, accidental exposure, or attacker movement after compromise. Least privilege therefore depends on a smaller review window and a faster remediation loop. Practitioners should treat stale access as a measurable reduction in control integrity, not a mere housekeeping issue.
From our research library:
- Only 5.7% of organisations have full visibility into their service accounts, according to the Ultimate Guide to NHIs.
- 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface, according to the Ultimate Guide to NHIs.
- Read next: Access Reviews and Certification Guide
What this signals
Recurring review cycles are what stop entitlement drift from becoming the normal state. Once permissions accumulate across roles, systems, and exceptions, least privilege depends on a control that keeps revalidating access against current business need. The programme risk is not a single bad grant, but the slow erosion of trust in the identity baseline.
Access review programmes should be judged by remediation quality, not certification volume. A completed review that leaves revoked permissions in place does not reduce exposure. The identity team needs a closed-loop process where entitlement changes are actually enforced across applications, cloud services, and databases.
Least privilege now has to be governed across human and non-human identities. The same lifecycle problem affects employees, contractors, service accounts, and other NHIs when access outlives accountability. That is why access certification should be designed as an identity lifecycle control, not a human-only compliance task.
For practitioners
- Map recurring review cycles to the highest-risk entitlements Start with privileged accounts, sensitive systems, dormant accounts, and any access tied to financial, production, or regulated data paths.
- Track revocation completion, not just review completion Confirm that removals propagate into connected applications, cloud platforms, and databases after certification decisions are made.
- Group entitlements by role and business function Use role-based grouping to reduce reviewer fatigue and make it easier to spot old department access or duplicated permissions.
- Separate privileged access reviews from standard user reviews Create a more frequent review path for administrators, service accounts, and other high-impact identities whose access can expand rapidly.
Key takeaways
- Least privilege fails when access is treated as a one-time approval instead of a recurring validation process.
- The article’s evidence is clear that overprivileged access is common and visibility is limited, which makes drift hard to spot without certification.
- Organizations need closed-loop remediation, because revoked access that is not actually removed leaves the control ineffective.
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 addresses the attack and risk surface, while NIST CSF 2.0, NIST SP 800-53 Rev 5 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-05 — Overprivileged NHI | Recurring reviews are needed because excessive permissions are the core risk pattern discussed here. |
| NHI-01 — Improper Offboarding | Stale access after role changes and departures mirrors offboarding failures across identity types. | |
| Recommendation — Review high-risk non-human and shared identities to remove excess permissions that outlive their business purpose. Revoke stale access at role change and offboarding events so permissions do not persist beyond accountability. | ||
| NIST CSF 2.0 | PR.AA-05 — Access Permissions, Entitlements and Authorizations | The article is fundamentally about governing entitlements and validating that access remains appropriate. |
| Recommendation — Continuously validate entitlements and remove permissions that no longer match current business need. | ||
| NIST SP 800-53 Rev 5 | AC-6 — Least Privilege | Least privilege is the control principle the article says must be maintained over time. |
| Recommendation — Enforce least privilege by reviewing and reducing excess rights on a recurring schedule. | ||
| CIS Controls v8 | CIS-5 — Account Management | Recurring access review and revocation are core account management functions. |
| Recommendation — Use account management processes to certify, revoke, and document unnecessary access at regular intervals. | ||
Key terms
- Least Privilege: A security principle requiring that every identity, human or non-human, is granted only the minimum permissions necessary to perform its function. Least privilege is the single most effective control for reducing NHI blast radius.
- Access Review: A formal process for confirming whether access is still needed and justified. In IAM programs, the review becomes an evidence-bearing control when decisions are recorded, scoped correctly, and traceable to the right reviewer, application owner, or auditor.
- Privilege Creep: Privilege creep is the gradual accumulation of access rights beyond what an identity actually needs. It usually happens when permissions are added for convenience and never removed. For NHIs, privilege creep expands blast radius and makes old credentials far more dangerous than their original purpose suggests.
- Access Certification: Access certification is the periodic review of whether an identity still needs its current entitlements. For NHIs, certification is only reliable when reviewers know the identity's owner, purpose, and expiry, otherwise stale machine access can persist long after the original use case has ended.
Deepen your knowledge
NHI governance, agentic AI identity, and machine identity lifecycle are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are building or maturing an IAM programme, it is worth exploring.
Published by the NHIMG editorial team on June 20, 2026.
Updated on October 6, 2026.
NHI Mgmt Group, the independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org