Business ownership and security ownership should be shared, but accountability must be explicit. Vendor risk teams need the contract context, IAM teams need the entitlement data, and control owners need evidence that access is revoked when the relationship ends. If no one owns the offboarding proof, the risk persists long after the vendor work is finished.
Why This Matters for Security Teams
Third-party access risk in banking GRC fails when ownership is split across procurement, vendor management, IAM, and the business without a named accountable party. The practical issue is not just “who approved access,” but who proves the access was narrowed, time-bound, and removed when the vendor relationship ended. That is why NHI governance guidance now treats offboarding and revocation as first-class controls, not administrative cleanup, especially where service accounts, API keys, and integrations outlive the contract. The problem is amplified by the scale of machine identities: NHIs outnumber human identities by 25x to 50x in modern enterprises, and only 20% of organisations have formal processes for offboarding and revoking API keys, according to the Ultimate Guide to NHIs. For control design, that makes shared responsibility necessary but not sufficient. Banking teams also need a clear line to governance frameworks such as the NIST Cybersecurity Framework 2.0 and the OWASP Non-Human Identity Top 10, because both emphasise identity governance, least privilege, and continuous control validation. In practice, many security teams encounter stale vendor access only after an audit, incident, or contract dispute has already exposed the gap.
How It Works in Practice
The cleanest operating model is to assign accountability to the business service owner, with security, IAM, and vendor risk acting as control partners. The business owner defines the use case and approves necessity. IAM owns the technical entitlement lifecycle. Security defines the control standard and evidence requirements. Vendor risk ensures the contract, exit clauses, and review cadence match the access model. That division aligns with the way non-human identities are handled in the Ultimate Guide to NHIs, which stresses lifecycle control, rotation, visibility, and offboarding, not just initial approval.
In practice, effective banking GRC programmes require three linked checks:
- Contractual context: the vendor agreement should name the service, data scope, and termination trigger for access removal.
- Entitlement proof: IAM should show exactly which accounts, tokens, certificates, or API keys the vendor can use.
- Revocation evidence: control owners should retain proof that access was removed, rotated, or expired when the relationship ended.
This is where NHI-specific risk becomes operational. The 52 NHI Breaches Analysis shows how compromised machine identities often become durable footholds, while the OWASP Non-Human Identity Top 10 reinforces that static credentials and weak lifecycle control are recurring failure modes. For third parties, best practice is increasingly to use short-lived access, JIT approval, and workload-scoped credentials rather than shared, long-lived secrets. These controls tend to break down when vendors embed credentials in code, scripts, or CI/CD pipelines because revocation then requires coordinated rotation across multiple systems.
Common Variations and Edge Cases
Tighter access control often increases onboarding friction and offboarding overhead, so banks have to balance operational speed against revocation certainty. There is no universal standard for every third-party pattern yet, especially where vendors provide managed services, outsourced support, or embedded software with opaque runtime dependencies. In those cases, current guidance suggests treating the vendor as a risk source but the business service as the accountability owner, because the business can actually confirm whether the access still supports an active need.
Edge cases usually fall into three buckets. First, some vendors need emergency access for production support, which argues for JIT access, session recording, and automatic expiry rather than standing entitlements. Second, some integrations use shared platform accounts, which should be retired in favour of workload identity and per-vendor credentials where feasible. Third, some banks discover that offboarding proof is missing because the contract ended before the technical removal was scheduled. That is a governance failure, not just an IAM issue. NHIMG research on Ultimate Guide to NHIs — Key Challenges and Risks shows why long-lived secrets and weak rotation create persistent exposure, and the same logic applies when a third party no longer has a business need but still retains a valid credential. In banking, the safest pattern is to make revocation evidence a contract deliverable, not an afterthought. Current practice still varies, but frameworks such as NIST Cybersecurity Framework 2.0 support that accountability model.
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 address the attack and risk surface, while NIST CSF 2.0 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Covers lifecycle and rotation gaps that keep third-party access alive too long. |
| NIST CSF 2.0 | PR.AC-4 | Addresses access governance and least privilege for third-party entitlements. |
| NIST AI RMF | Govern function supports clear accountability for autonomous or delegated access. |
Assign and review third-party access under least-privilege controls with named owners.
