Organisations should treat third-party risk as a shared governance function, not a periodic checklist owned by one department. Legal and procurement can lead onboarding, but security, privacy, ethics, ESG, and IT need ongoing visibility into vendor operations, data sharing, and control posture. That collaboration reduces duplicate reviews, closes analysis gaps, and improves the business’s overall risk posture.
Why Third-Party Risk Breaks Down Across Departments
Third-party risk usually fragments because each team sees a different part of the vendor relationship. Legal focuses on contractual terms, procurement on commercial selection, security on technical controls, and compliance on policy or regulatory obligations. The result is not just duplication, but blind spots, especially when vendor access, data handling, and ongoing control changes are not tracked in one shared workflow.
That fragmentation matters because the risk is created by the whole relationship, not one review step. A vendor can look acceptable at onboarding and still become high risk later if its access expands, its subprocessors change, or its controls degrade. Shared governance works best when teams maintain a common view of the vendor lifecycle, including onboarding, monitoring, renewal, escalation, and offboarding.
For organisations building a shared model, the objective is to make the review path reflect the actual control question. Contract language, data processing terms, access scope, assurance evidence, and exception handling should be connected so that no team assumes another team has already validated a risk that has only been documented, not resolved. Ultimate Guide to NHIs is useful here because it frames visibility, lifecycle, and third-party exposure as governance issues, not isolated technical tasks.
What Shared Governance Looks Like in Practice
The practical fix is a single operating model for third-party risk, with clear ownership for each decision point. Legal should own the terms that define liability, data use, audit rights, and exit obligations. Procurement should own intake, vendor classification, and commercial leverage. Security should own risk assessment, control verification, and remediation tracking. Compliance should ensure the process satisfies regulatory and internal policy requirements without turning every review into a separate, disconnected checklist.
What changes at scale is coordination, not just workload. As vendor counts grow, the biggest failure is inconsistent answers to the same question: who approved access, who verified controls, who is monitoring changes, and who can force escalation. A shared register, standard assessment criteria, and a common exception path reduce rework and make it easier to spot vendors that have drifted outside tolerance. The same principle applies to access and secret governance when vendors hold system-level credentials or integration tokens; those items must be visible to the teams responsible for the relationship.
Organisations should also separate initial approval from ongoing oversight. Many silos only surface during onboarding, but third-party risk is dynamic. Assurance evidence expires, controls change, subcontractors are added, and integrations expand. If renewal and monitoring do not trigger re-review, the organisation is operating on stale assumptions. A shared model forces the right teams back into the loop when the vendor’s real risk profile changes.
For an applied supply-chain example, the lesson from Klue OAuth Supply Chain Breach is that third-party exposure is often created by the integration path, not the vendor brand alone. That is why legal terms, procurement due diligence, and security review need a common view of how the vendor actually connects to business systems.
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 surface, NIST CSF 2.0, CIS Controls v8 and NIST Zero Trust (SP 800-207) set the technical controls, and ISO/IEC 42001:2023 define the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | GV.SC-4 — Cyber Supply Chain Risk Management | Directly addresses third-party risk governance across supplier relationships. |
| GV.RM-01 — Risk Management Strategy | Supports aligning legal, procurement, security, and compliance around one risk model. | |
| Recommendation — Establish shared supplier risk processes that cover onboarding, monitoring, and offboarding. Define one enterprise third-party risk strategy and assign clear decision ownership. | ||
| CIS Controls v8 | 15.1 — Service Provider Management | Covers third-party oversight, due diligence, and ongoing supplier management. |
| 6.1 — Access Control Management | Applies where vendors receive access and that access must be governed across teams. | |
| Recommendation — Maintain an inventory of providers and review their controls on a recurring basis. Restrict third-party access to approved business needs and review it regularly. | ||
| ISO/IEC 42001:2023 | A.5.5 — AI system impact assessment | Material when third parties include AI-enabled services that require shared governance. |
| Recommendation — Assess third-party AI services for impact, accountability, and oversight before approval. | ||
| NIST Zero Trust (SP 800-207) | SC-4 — Access Control Policy and Enforcement | Relevant when vendor access must be continuously governed under a zero-trust model. |
| Recommendation — Enforce least-privilege access for vendors and re-evaluate access conditions continuously. | ||
| OWASP Non-Human Identity Top 10 | NHI-01 — Identity Inventory and Ownership | Applies when third parties hold non-human identities, tokens, or service credentials. |
| NHI-04 — Secrets and Credential Management | Relevant because vendor integrations often rely on tokens, keys, and other shared secrets. | |
| Recommendation — Inventory third-party non-human identities and assign a named owner for each one. Rotate and vault third-party credentials so vendor access can be revoked quickly. | ||
Practitioner Guidance
What to prioritise: Build one intake and exception workflow for all third parties, with a shared risk record that every function can update but no one function can silently override. The record should show who owns the vendor, what data it touches, what systems it reaches, and what evidence last validated the approval.
What to verify: Make sure the review process covers both contract and technical reality. A signed agreement is not enough if the vendor has broader access than the contract implies, or if the control evidence is older than the integration change that made the vendor more sensitive.
Practitioner takeaway: The goal is not to merge every team into one reviewer, but to prevent any team from making a partial decision that looks complete until the vendor is already embedded in the business.
Related resources from NHI Mgmt Group
- Who should own third party risk management across security, legal, and procurement?
- How should security and compliance teams implement continuous monitoring across third-party risk programs in 2025?
- How should security teams manage third-party vendor risk across external applications?
- How should security teams implement a third-party risk management policy across SaaS, cloud, and AI tools?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 23, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
