Ownership should sit with the business function that depends on the access, not with the security team alone. Third-party and project access is especially risky when nobody is accountable for expiry, scope reduction, or removal after the work ends.
Who should own access decisions for third-party and project users?
Ownership should sit with the business function that depends on the access, not with the security team alone. Third-party and project access is especially risky when nobody is accountable for expiry, scope reduction, or removal after the work ends.
What ownership means in practice
For third-party and project users, ownership means more than approving the initial request. The owner is the person who can explain why access is needed, who should have it, how long it should last, and what should happen when the work changes. That is usually the service line, project sponsor, or application owner closest to the operational need.
Security should define the control model, challenge weak requests, and verify that approvals, reviews, and revocations happen, but it should not be the long-term business approver for access it does not use. If ownership sits too far from the work, access tends to persist after contracts end, projects pause, or staff rotate out.
In practice, the clearest line is that the business owner approves necessity and scope, while the security or IAM function enforces the process. That split preserves accountability: business teams own the decision, and control teams own the guardrails.
Why third-party and project access needs a named owner
Third-party and project access is time-bound by nature, so the main control failure is not usually the first approval, it is the failure to close the loop. This is why access governance programs emphasise sponsorship, time limits, reviews, and offboarding for external users and temporary collaborators. Third-Party, B2B and Contractor Access Guide is a useful reference point for that ownership model.
Without a clear owner, access reviews become rubber-stamp exercises and nobody feels accountable for narrowing permissions when the original task changes. A project manager may know when the project ends, but the business function that benefits from the access is usually the right party to confirm whether it is still needed. That is the practical reason access decisions should follow the work, not the security queue.
For organisations trying to formalise this, the ownership question usually aligns with entitlement governance: who can justify the access, who can attest to it, and who is responsible when it becomes stale. IAM and IGA Basics covers that separation between provisioning, authorization, and governance in a way that maps cleanly to third-party and project accounts.
How to structure approvals so ownership stays accountable
The most reliable model is: requestor, approver, and owner should be different roles where possible. The requestor states the need, the business owner approves the access, and the platform team enforces the expiry and control checks. For external suppliers, the owner should also be able to name the sponsoring relationship and confirm the offboarding trigger.
What to verify: every non-employee account should have a named business sponsor, a documented purpose, a defined expiry, and a review date. If the approver cannot explain why the access is still needed, treat that as a signal to reduce scope or remove it.
What good looks like: access is granted with least privilege, reviewed on a schedule that matches the business use, and removed automatically or by explicit owner confirmation when the project closes or the vendor engagement ends.
When teams need a governance pattern for recurring reviews, access certification is the right operational mechanism, especially where external users and temporary project accounts are involved. Access Reviews and Certification Guide is relevant because it focuses on closing access, not just checking a box.
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 SP 800-53 Rev 5 and OWASP ASVS set the technical controls, while ISO/IEC 27001:2022 and SOC 2 (AICPA) define the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-5 — Account Management | Third-party and project access depends on lifecycle control of external accounts and sponsors. |
| Recommendation — Require named owners, timed access, and removal checks for every external or project account. | ||
| NIST SP 800-53 Rev 5 | AC-2 — Account Management | The question is about ownership and lifecycle control of third-party and project user access. |
| AC-6 — Least Privilege | Owner-driven access decisions should keep third-party and project users scoped to minimum necessary access. | |
| Recommendation — Assign accountable owners for account creation, review, and termination. Limit external and project users to the smallest permissions needed for the approved task. | ||
| ISO/IEC 27001:2022 | A.5.18 — Access rights | Ownership of access decisions is directly tied to granting, reviewing, and removing rights. |
| Recommendation — Define owners for access approval, review, and timely revocation. | ||
| OWASP ASVS | V8 — Authorization | Access ownership affects who may receive and retain permissions for a task or integration. |
| Recommendation — Verify that authorization decisions are tied to a business-approved scope and expiry. | ||
| SOC 2 (AICPA) | CC6.1 — Logical and Physical Access Controls | Third-party and project access needs accountable access approval and revocation controls. |
| Recommendation — Implement access approval and removal controls with clear business ownership. | ||
Practitioner Guidance
What to prioritise: assign a named business owner for every third-party and project access path before the account is created. If you cannot name the person who will later approve removal, the access is already under-owned.
Common mistake: routing all approvals through security or the help desk because it feels faster. That may speed up intake, but it breaks accountability for business necessity, scope reduction, and end-of-engagement cleanup.
Decision rule: if the access exists to support a contract, engagement, or project, the sponsor of that work should own the decision; if no sponsor can be named, the request should be escalated rather than approved by default.
Practitioner takeaway: good ownership is not about who clicks approve, it is about who is accountable when the access should shrink or disappear.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on October 11, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org