Use a dual verification process before any transfer is approved. Confirm the request through a trusted contact method, compare it with known payment history, and require a small initial transfer when funds are moving to a new account. That extra step reduces the chance that a compromised mailbox or impersonation email can redirect a large payment.
When a payment request comes from an email, the safest assumption is that the message may be altered, forwarded, or impersonated. Treat the request as untrusted until the payment instruction is confirmed through an independent channel and the account details have been checked against an established vendor record or approved payee file.
For higher-risk changes, such as a new beneficiary account or an urgent executive request, the control should be stronger than a simple callback. Require out-of-band verification with a known contact, a second approver, and a small test payment before any material transfer leaves the organisation.
That discipline matters because payment fraud often succeeds by exploiting process shortcuts rather than technical compromise. The issue is not only whether the email looks convincing, but whether the organisation has a verified habit for separating payment approval from the channel that delivered the instruction.
How to verify a transfer request without relying on the email
Use the request as a prompt to verify, not as authority to pay. A trusted contact method means a number or workflow already held in your records, not one supplied in the same message. Compare the instruction against prior payment patterns, beneficiary names, bank identifiers, invoice history, and any known changes logged by procurement or finance.
If the request involves a first-time account or a change in payment destination, apply a low-value test transfer before releasing the full amount. That approach gives finance teams a chance to detect a mismatch, returned payment, or dispute signal before the loss becomes large.
Where payment instructions regularly come from executives or vendors, the process should be formalised so staff are not forced to judge each email ad hoc. The control works best when the verification steps are routine, documented, and resistant to urgency language in the message itself.
What strong payment verification looks like in practice
The practical goal is to make fraud harder than legitimate payment processing. That means separating request, approval, and execution; keeping a verified supplier master record; and requiring exception handling when account details change unexpectedly. A one-off email should never be enough to override the organisation’s standard disbursement path.
Finance teams should also be alert to behavioural cues that do not prove fraud on their own but do justify extra checking, such as pressure to bypass normal approvers, secrecy about a new bank account, or instructions that differ from the vendor’s usual payment cadence. The key is to treat those cues as triggers for verification, not as proof by themselves.
If the organisation uses delegated payment authority, the authority chain should still end in an independent check before funds move. Strong control design assumes that mailboxes, inbox rules, and display names can all be compromised or spoofed.
Risk and Threat Considerations
Payment requests are a common target for impersonation, mailbox compromise, and business email fraud because they create a direct path from social engineering to money movement. The main risk is not only a false invoice, but a trusted-looking request that causes staff to send real funds to an attacker-controlled account.
Failure mechanism: The attacker relies on urgency, authority, or a routine vendor relationship to bypass normal verification, then redirects the transfer to a different beneficiary or account with minimal scrutiny.
Impact: The organisation can lose funds quickly, face recovery delays, disrupt supplier relationships, and expose itself to repeated fraud attempts once a weak approval pattern is discovered.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK and OWASP API Security Top 10 address the attack and risk surface, while NIST SP 800-53 Rev 5 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Payment verification depends on controlling and validating the credentials or channels used to approve transfers. |
| AC-3 — Access Enforcement | Dual approval and payee controls rely on enforcing who can initiate or release funds. | |
| AU-6 — Audit Review, Analysis, and Reporting | Verified transfer workflows need logs to detect abnormal payment changes and fraud attempts. | |
| Recommendation — Enforce strong credential lifecycle controls for payment approvers and rotate any compromised access immediately. Restrict payment initiation and release rights so a single email cannot trigger an approved transfer. Review transfer logs for beneficiary changes, unusual urgency, and repeated approval exceptions. | ||
| CIS Controls v8 | CIS-6 — Access Control Management | Payment approvals and beneficiary changes are access decisions that should be limited and reviewed. |
| CIS-17 — Incident Response Management | Fraudulent transfer requests require a defined response path once suspected or confirmed. | |
| Recommendation — Limit who can create, change, or approve payees and payment releases. Define a rapid response process for suspected payment fraud, including hold, verify, and report steps. | ||
| MITRE ATT&CK | T1566 — Phishing | Email-based payment fraud commonly uses phishing or impersonation to induce transfer approval. |
| Recommendation — Hunt for phishing indicators when payment requests deviate from normal vendor communication patterns. | ||
| OWASP API Security Top 10 | API2 — Broken Authentication | The core issue is proving the requester is who they claim to be before acting on the request. |
| Recommendation — Require independent authentication for sensitive payment instructions before any release. | ||
Practitioner Guidance
What to verify: Before approving any transfer, verify the beneficiary through a contact path already on file, not through reply-to details in the email. For any new bank account, confirm that the request matches a known vendor change process and that the approver chain is intact.
Decision rule: If the instruction changes account details, requests urgency, or comes from an executive outside the normal workflow, treat it as a high-risk payment and require dual approval plus a test transfer before releasing the full amount.
Practitioner takeaway: The most effective control is not email inspection, it is forcing every payment exception through an independent verification path that the sender cannot control.
Related resources from NHI Mgmt Group
- How can organisations reduce the impact of vendor fraud in email workflows?
- How should organisations prevent vendor email compromise from bypassing normal approval workflows?
- Why do email-based vendor payment scams still work in mature organisations?
- What should organisations do when vendor email compromise targets finance, sales, and project teams at the same time?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 26, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
