Organisations should separate duties, require independent approval for high-value transactions, and review access rights after role changes. Financial systems need transaction limits, audit trails, and exception reporting so one person cannot create, approve, and release payments end to end. Regular spot checks of vendor records and payment requests help detect forged approvals before losses compound.
How to Stop One Person From Controlling the Entire Payment Path
The control objective is simple: no single employee should be able to create, approve, and release value without an independent check. That means splitting payment duties across people or systems, setting approval thresholds by risk, and making exceptions visible enough that unusual payment behaviour is reviewed before it becomes a loss.
Strong approval control is really a workflow design problem. If the same role can edit vendor master data, create a payment, approve it, and trigger release, the organisation has created a single-point fraud path. The fix is to break that path at multiple points, not just add a second signature at the end.
Transaction controls only work when they are matched to the value and volatility of the payment process. For routine low-value payments, automated controls and post-event sampling may be enough. For high-value or out-of-pattern transactions, approval should be independent, traceable, and supported by audit evidence that can be reviewed later. CIS Controls v8 is a useful implementation reference for account management, audit logging, and access control, while NIST Cybersecurity Framework 2.0 helps connect those controls to governance, detect, and respond outcomes.
Where payment authority is tied to role changes, leave, or project moves, access review becomes part of fraud prevention, not just IAM hygiene. If an employee’s duties change but approval rights stay in place, the control environment can lag behind reality. That is one reason organisations should review access after role changes and maintain an auditable record of who can approve what, and why.
For broader control design, organisations should treat vendor changes and payment exceptions as higher-risk than standard invoice processing. Forged approvals often succeed because the surrounding data, like supplier bank details or invoice references, is trusted too easily. A control that only checks the payment instruction, but not the vendor record or the approval provenance, leaves a gap that internal fraud can exploit.
The practical standard for a resilient process is simple: the approver should be independent, the threshold should be enforced by system logic, and the release action should leave a tamper-evident trail. Where those three conditions are not true, the process is relying on trust in a single operator rather than control design.
Risk and Threat Considerations
The main risk is internal fraud enabled by weak segregation of duties. When one person can move from request to approval to release, the organisation has a concentrated control failure that can produce direct financial loss, concealment of the fraud, and delayed detection if exception reporting is weak.
Failure mechanism: The attacker or dishonest employee abuses trusted workflow access, alters payment details, or forges approval states in a process where no independent check interrupts the transaction path.
Impact: Funds can be diverted in a way that looks operationally normal at first, which increases loss size, complicates recovery, and can undermine trust in the finance control environment.
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 800-53 Rev 5 set the technical controls, while NIS2 define the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | 6 — Access Control Management | Prevents a single user from retaining excessive payment-system permissions. |
| 8 — Audit Log Management | Payment diversion is harder to hide when approvals and releases are logged and reviewed. | |
| 5 — Account Management | Role changes and leavers can leave approval rights behind if account lifecycle is weak. | |
| Recommendation — Enforce least-privilege access and review payment-role entitlements after role changes. Enable tamper-evident logging for approvals, vendor edits, and payment releases. Revoke or adjust approval access immediately when duties or employment status change. | ||
| NIST CSF 2.0 | PR.AA — Identity Management, Authentication and Access Control | Approval controls depend on enforcing who can initiate, approve, and release funds. |
| DE.CM — Continuous Monitoring | Exception reporting and spot checks detect unusual payment and vendor activity. | |
| GV.RM — Risk Management Strategy | Approval thresholds and segregation of duties are governance decisions tied to fraud risk. | |
| Recommendation — Restrict payment actions to explicitly authorised roles and separate initiation from approval. Monitor payment exceptions, vendor changes, and high-value approvals for anomalous patterns. Set control thresholds by transaction risk and business impact, not convenience. | ||
| NIS2 | Art. 21 — Cybersecurity Risk-Management Measures | Strong access, logging, and incident-ready governance support payment-control resilience. |
| Recommendation — Implement access control, logging, and governance measures that limit unauthorised financial actions. | ||
| NIST SP 800-53 Rev 5 | AC-5 — Separation of Duties | Directly matches the need to prevent one employee from controlling the full payment path. |
| AU-2 — Event Logging | Approvals and overrides need logs for investigation and deterrence. | |
| AC-6 — Least Privilege | Limits the ability of one employee to accumulate broad payment authority. | |
| Recommendation — Separate payment creation, approval, and release duties across different roles. Record approvals, overrides, vendor changes, and payment releases in audit logs. Limit each user to only the payment permissions needed for their role. | ||
Practitioner Guidance
What to verify: Confirm that no single role can both create and release a payment above the lowest material threshold. The test is not whether the policy says “two approvals,” but whether the configured system actually prevents a lone operator from completing the full transaction path.
What to prioritise: Focus first on the highest-blast-radius payment paths, including vendor bank changes, urgent payments, manual overrides, and any exception process that bypasses standard approval queues. Those are the routes most likely to be abused when controls are weak.
Common mistake: Treating review after payment as equivalent to approval before payment. Post-event detection helps limit repeat abuse, but it does not replace preventive control when the organisation can still stop the payment before release.
Practitioner takeaway: The strongest anti-diversion control is not more paperwork, but a payment workflow that makes unilateral misuse impossible or immediately obvious, with independent approval, constrained privileges, and evidence that exceptions were actually reviewed.
Related resources from NHI Mgmt Group
- Who is accountable when personal data is leaked through employee error or weak controls?
- How can organisations prevent orphaned AI agents after employee turnover?
- When should organisations require more than a single approval channel?
- Who is accountable when a small business breach spreads through weak access controls?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 19, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
