Security teams should treat expense platforms as governed financial systems, not simple workflow apps. They need scheduled access recertification, role based approvals, removal of dormant accounts, and evidence that permissions match current job duties. Automated review workflows help reduce human error, create audit trails, and make it easier to prove compliance with controls tied to sensitive financial and employee data.
How access reviews should work for expense and travel platforms
Expense and travel systems usually sit between finance, HR, and employee workflow, which is why access reviews need to be run like control assurance, not a checkbox exercise. The review should confirm who can submit, approve, amend, export, or administer records, and it should be tied to job role, cost centre, and approval authority rather than to mere system familiarity. Lifecycle and recertification discipline matters because stale access in a financial platform can create both fraud exposure and audit failures.
Reviews work best when they are scheduled, evidence-based, and ownership-driven. That means using current employee and manager data, checking for dormant or unused accounts, and validating that elevated roles still match business need. If the platform allows delegated approval, bulk import, integration admin, or export permissions, those entitlements deserve explicit review because they carry disproportionate impact compared with ordinary user access.
Automation helps here, but only when it supports a controlled human decision. Automated routing, reminders, and escalation reduce missed reviews and create a defensible record, while reviewers still need enough context to approve, revoke, or reassign access based on actual duties. Teams should prefer a simple, repeatable review pattern over ad hoc exceptions because inconsistency is usually what weakens assurance in practice.
What to review, and what good evidence looks like
A useful review scope starts with the access model itself: requester, approver, auditor, expense policy admin, travel policy admin, integration owner, and any role that can change policies or move data out of the system. The right question is not just whether an account exists, but whether it still needs the same authority after a transfer, leave of absence, role change, or vendor relationship change. That is why current employment status and manager attestation are central to the review.
Good evidence is usually straightforward: the role list, the reviewer’s decision, the reason for retention or revocation, timestamps, and the ticket or workflow record showing who approved the change. For sensitive entitlements, teams should retain proof that the permission was checked against the actual business function, not merely against a generic role name. Where possible, pair the access review with periodic logs showing whether the account has been used, because unused but active access is often the clearest sign that the entitlement is no longer justified.
For platforms that touch employee reimbursements, travel bookings, or finance exports, CIS Controls v8 provides a practical control lens for account management, least privilege, and audit logging. That is especially useful when the business wants one review process that can satisfy both operational security and audit requirements without turning the exercise into a manual spreadsheet chase.
Risk and Threat Considerations
Expense and travel platforms concentrate payment data, employee data, and approval authority in one place, so weak access governance can turn a routine workflow system into a fraud and privacy exposure point. The main risk is not just excessive access, but access that stays valid after a job change, team move, or administrative reshuffle, which creates opportunities for unauthorized approvals, data export, or policy manipulation.
Failure mechanism: Dormant accounts, stale admin roles, and broad approval rights persist because reviews are irregular, reviewer context is weak, or ownership of the entitlement is unclear. That leaves a path for misuse through legitimate credentials rather than through obvious intrusion.
Impact: Unjustified access can enable fraudulent reimbursements, inappropriate disclosure of travel or expense data, and audit findings when the organisation cannot show that access was recertified and removed on time. At scale, the same control gap becomes harder to detect because unused access blends into normal user churn.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8, NIST CSF 2.0 and NIST SP 800-63 set the technical controls, while PCI DSS v4.0 define the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | 5 — Account Management | Expense platform recertification depends on reviewing and removing stale accounts. |
| 6 — Access Control Management | The topic is fundamentally about least-privilege access and role-based approval rights. | |
| 8 — Audit Log Management | Access reviews need evidence trails that show who approved or removed access and when. | |
| Recommendation — Review active accounts regularly and remove dormant access tied to expense systems. Restrict expense platform entitlements to current business need and role authority. Retain review and approval logs that prove access decisions were made and enforced. | ||
| NIST CSF 2.0 | PR.AA — Identity Management, Authentication and Access Control | Governed access reviews are part of enforcing who may use financial workflow systems. |
| GV.RM — Risk Management Strategy | Expense systems carry financial and employee-data risk that needs formal governance. | |
| DE.CM — Continuous Monitoring | Dormant and excessive access is easier to catch when usage is monitored alongside recertification. | |
| Recommendation — Apply identity and access controls to ensure expense platform permissions remain justified. Classify expense platforms as governed systems and review access on a defined cadence. Monitor entitlement use so unused expense access can be challenged and revoked. | ||
| PCI DSS v4.0 | 7 — Restrict Access by Business Need to Know | The answer emphasizes limiting access to current job duties and approval authority. |
| 8.6 — Manage Interactive System and Application Accounts | Admin and elevated platform accounts need explicit review, not assumed legitimacy. | |
| Recommendation — Limit expense platform access to users with a current business need and approved role. Review system and application accounts used in the platform and remove unnecessary interactive access. | ||
| NIST SP 800-63 | IAL — Identity Proofing and Registration Assurance | Current employee identity and employment status underpin trustworthy access recertification. |
| AAL — Authenticator Assurance Level | Access review is stronger when high-risk roles use stronger authentication and session controls. | |
| Recommendation — Validate that the identity and employment basis for platform access is still current. Apply stronger authentication for privileged expense and travel platform access. | ||
Practitioner Guidance
What to prioritise: Start with privileged and exception-based access, not ordinary end-user logins. Roles that can approve payments, edit policies, manage integrations, export data, or administer the platform should be reviewed first because they have the highest blast radius if misused.
What to verify: Make sure each reviewer can see the employee’s current manager, department, and business justification before signing off. If the review workflow cannot surface those facts, the process is too weak to trust, even if it produces an audit trail.
Common mistake: Treating “everyone has a role” as evidence of control. A role catalogue is not recertification, and a completed workflow is not assurance unless the access decision was compared with current duties and dormant accounts were actually removed.
Practitioner takeaway: The review process should prove that access still matches a real business need, not just that someone clicked approve on a schedule.
Related resources from NHI Mgmt Group
- How should security teams automate access reviews for core banking platforms with granular role-based permissions?
- How should security teams run access reviews for non-human identities?
- How should security teams govern non-human identities that have persistent access?
- How should security teams govern API keys used for generative AI access?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 18, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
