Access reviews close the gap between policy and reality
Most organizations have an access policy. Far fewer can show, at a specific moment, who can reach each critical system, why that access exists, and who approved it. That gap is where excess privilege accumulates. A former employee remains in a group, a vendor keeps access after a project ends, or an administrator retains standing rights that were needed only for a one-time change.
An access review is a repeatable decision process: compare current entitlements with the person’s role and business need, confirm what should remain, remove what is no longer justified, and retain evidence of the decision. It is not a one-time cleanup or a spreadsheet exercise. It is a control that keeps identity data aligned with how the business actually operates.
NIST Cybersecurity Framework 2.0 places identity management, authentication, and access control under the Protect function. Its access-control outcomes include defined, enforced, and reviewed permissions based on least privilege and separation of duties. That makes the review rhythm relevant to both security leaders and anyone responsible for proving that controls work.
Build one inventory before you review
A review cannot be better than the inventory behind it. Start by listing the systems and resources that could create material business, financial, privacy, or operational impact if accessed incorrectly. For many growing companies, that includes Microsoft 365, email, file repositories, endpoint management, accounting, payroll, CRM, line-of-business applications, backup consoles, cloud platforms, and external collaboration sites.
For each resource, record the identity or group, permission level, owner, last sign-in or use when available, start date, expiration date, and reason for access. Include non-human identities such as service accounts, automation identities, shared mailboxes, API keys, and emergency administrator accounts. These often sit outside ordinary joiner-mover-leaver processes and can become invisible paths into sensitive data.
Minimum inventory fields
- Resource: What application, group, site, device, or data set is being protected?
- Principal: Which user, vendor, service, or administrator has access?
- Entitlement: Is the access read-only, contributor, owner, administrator, or something more specific?
- Business owner: Who can decide whether the access is still necessary?
- Evidence: When was the access last used, approved, changed, or reviewed?
Do not wait for perfect tooling. Exporting a first report from Microsoft Entra ID, a SaaS platform, or a critical application can reveal obvious stale accounts and broad groups. The goal of the first pass is to establish a trustworthy starting point and identify the systems that need deeper attention.
Use risk tiers to set the right rhythm
Not every permission deserves the same review frequency. A practical program separates access by risk and assigns an owner and cadence to each tier. This keeps the process manageable while directing attention where a mistake would matter most.
- Critical access: Review privileged roles, security tools, backup administration, financial approval, production environments, and repositories containing regulated or highly confidential data at least quarterly. Use a second approver when separation of duties is important.
- High-risk access: Review broad file shares, customer data, external collaboration, and sensitive business applications quarterly or semiannually, depending on change volume and regulatory expectations.
- Standard access: Review ordinary application groups and role-based permissions semiannually or annually, with immediate review after a role change or manager notification.
- Temporary access: Give project, vendor, and emergency access an expiration date at creation. Review it at the end of the engagement rather than relying on someone to remember later.
Microsoft Entra access reviews support scheduled or ad hoc reviews, delegated decisions, tracking, and automated removal of access based on outcomes. The platform can help execute the workflow, but technology does not replace a clear owner. Every review should answer who made the decision, what information they considered, and what happened afterward.
Use triggers in addition to the calendar. A termination, transfer, acquisition, new application, security incident, or material change to a vendor relationship should start an out-of-cycle review. Calendar-based reviews find drift; event-based reviews respond to change.
Make review evidence audit-ready
A reviewer clicking “approve” is not enough evidence on its own. A defensible record should show the review scope, date, decision maker, access presented, decision for each item, reason for exceptions, remediation owner, and completion date. Keep the record in a protected location with retention aligned to the needs of the business and any applicable contractual or regulatory obligations.
Write decision prompts that produce consistent answers. Instead of asking, “Does this user still need access?” ask, “Does this user need contributor access to the customer data workspace to perform the responsibilities assigned to their current role?” Specific prompts reduce rubber-stamping and make decisions easier to explain later.
- Approved: The access is still required and matches the role.
- Reduced: The user needs the resource but not the current level of privilege.
- Removed: The business need has ended or cannot be confirmed.
- Escalated: The owner needs security, legal, finance, or executive input before deciding.
- Exception: The access remains outside the normal pattern with a documented reason and expiration date.
Preserve reports and change logs in a way that makes them easy to retrieve. An auditor, insurer, customer, or incident-response team may care less about the review dashboard than the underlying proof that a decision was made and the resulting access change actually occurred.
Turn exceptions into remediation work
The most valuable part of a review is what happens after the decision. Assign each removal, reduction, or exception to a named person with a due date. High-risk changes should be verified after completion, not simply marked done. If an entitlement cannot be removed because an application lacks granular controls, document the compensating control and the plan to address the limitation.
Look for patterns across review cycles. Repeated exceptions may point to an inaccurate job role, an overly broad group, a vendor process that never closes, or an application that needs redesign. Repeated stale access may indicate that offboarding is not connected to identity systems. The review is therefore both a control and a diagnostic for the operating model.
Pair access reviews with strong authentication, privileged identity management, device requirements, and logging. CISA and the National Security Agency’s identity and access management guidance emphasizes that organizations should address gaps in identity proofing, authentication, and access management together. A quarterly review cannot compensate for weak authentication or missing visibility, but it can expose where those weaknesses are concentrated.
A 90-day access review rollout
Small businesses can establish a useful rhythm without launching a large compliance program. In the first 30 days, choose three critical systems, name business owners, export current entitlements, and resolve obvious terminated or unknown accounts. Capture the baseline and preserve the initial decisions.
During days 31 through 60, define risk tiers, set review cadences, add expiration dates to temporary access, and create a standard evidence record. Run one supervised review with a manager and a technical owner so the business can see where the workflow slows down or produces ambiguity.
During days 61 through 90, automate reminders and low-risk removals where appropriate, test that completed changes are visible in logs, and report a small set of measures: completion rate, stale access removed, privileged accounts reviewed, overdue remediation, and exceptions nearing expiration. Then set the next review date before the current cycle closes.
Access governance is not about distrusting employees or creating paperwork for its own sake. It is about making business need visible, limiting the blast radius of a compromised account, and giving leaders evidence that protection is working. A consistent review rhythm turns identity from a static directory into an actively managed security and compliance control.
