Who should own third-party app permission review when business teams want to add new integrations?

Ownership should be shared, but security must retain final oversight. Business owners can justify the use case, and IT can manage deployment, but security should validate the risk, approve exceptions, and track permission changes over time. Without that control point, app onboarding becomes a shadow access path instead of a governed decision.

Why Ownership Has to Be Shared, Not Handed Off

Third-party app permission review sits at the intersection of business need, technical deployment, and security risk. Business teams usually understand why the integration is needed and what outcome it should deliver, but they should not be the only approver when the request expands the organisation’s access footprint. Permission scope changes the trust boundary, so ownership needs to include a control function that can challenge the request, not just fulfil it.

A useful way to frame ownership is by decision rights. The business should define the use case and expected data access, IT should manage the mechanics of onboarding and configuration, and security should own the permission-risk decision. That prevents the review from becoming a purely operational intake step where access is granted because the integration is convenient or already approved elsewhere.

That division matters most when the app requests access to data, message streams, calendars, files, admin scopes, or other permissions that can be reused beyond the original use case. In practice, the reviewer is not only judging whether the app works, but whether the requested access is proportionate, traceable, and consistent with least privilege. In identity terms, the issue is not the integration itself, but the authority it creates.

What Security Must Retain in the Review Process

Security should retain final oversight because permission grants are often durable, difficult to notice later, and easy to spread across multiple business teams. A shared review model only works if someone can veto excessive scopes, require a narrower permission set, or reject a request until the owner can justify why the integration needs that access. That is especially important for SaaS connectors and OAuth-based apps, where consent can become a standing access path.

The practical control point is ongoing permission governance, not one-time approval. The team responsible for oversight should be able to validate what was granted, confirm whether the app still needs it, and review changes when the vendor adds scopes, the business use case changes, or the app is repurposed. For a good example of why this matters, see the Salesloft OAuth token breach and the Klue OAuth Supply Chain Breach, both of which show how third-party access can turn into broader data exposure.

Shared ownership also reduces the risk that no one feels accountable for exceptions. Business teams can explain why a request matters, but security has to make the final judgement on whether the risk is acceptable. Without that separation, organisations tend to accumulate unused or over-broad integrations that remain trusted long after the original business need has changed.

How to Structure Accountability So Reviews Stay Governed

The cleanest model is a three-part responsibility split. Business owners justify the request and identify the data or workflow the integration supports. IT or platform teams handle provisioning, configuration, and technical deployment. Security owns risk validation, exception approval, and periodic re-review. That pattern keeps the process fast enough for the business while preserving a real control point over access.

Two practical tests help keep the model honest. First, ask whether the request would still be approved if the integration were not already popular with other teams. Second, ask whether the app can be limited to the minimum permission set needed to do the job. If the answer to either question is no, the request should come back for tighter scope, stronger justification, or a formal exception.

For teams looking for a broader identity and access lens on the same problem, the Ultimate Guide to NHIs, Key Challenges and Risks is useful because it connects privilege, lifecycle, and visibility gaps to real-world access governance. The same governance logic also aligns with OWASP Non-Human Identity Top 10, which treats overprivilege, secret leakage, and third-party risk as recurring failure modes in app and service access.

Risk and Threat Considerations

When business teams can add integrations without security oversight, permission review becomes a shadow access channel. The most common failure mode is not a dramatic breach on day one, but gradual scope creep: a harmless-looking app is approved for a narrow use case, then reused, over-scoped, or left in place after the original need has passed.

Failure mechanism: The organisation grants standing third-party access based on business convenience rather than controlled risk review, allowing excessive scopes, weak ownership, and unnoticed permission expansion.

Impact: A compromised or misused integration can expose sensitive data, create lateral access into core systems, or bypass normal approval and monitoring paths, making later containment harder.

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 and OWASP API Security Top 10 address the attack and risk surface, while NIST SP 800-53 Rev 5 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.

Framework	Control / Reference	Relevance
OWASP Non-Human Identity Top 10	NHI-05 — Overprivileged NHI	Third-party app permissions often become excessive access scopes.
	NHI-03 — Vulnerable Third-Party NHI	Business-added integrations create third-party access risk and dependency exposure.
	NHI-01 — Improper Offboarding	Integrated apps need lifecycle review so stale access is removed promptly.
Recommendation — Restrict app scopes to the minimum access needed and reject unnecessary privilege expansion. Assess third-party app trust, access paths, and vendor risk before onboarding. Remove inactive integrations and revoke permissions when the business need ends.
NIST SP 800-53 Rev 5	IA-5 — Authenticator Management	Permissioned integrations depend on controlling and reviewing credential-like access material.
	AC-6 — Least Privilege	The core question is who may approve the minimum necessary access for an app.
	AU-2 — Event Logging	App permissions need auditability so changes and exceptions are visible over time.
Recommendation — Track, rotate, and revoke integration credentials and tokens on a defined lifecycle. Limit third-party app access to the least privilege required for the approved use case. Log permission grants, scope changes, and exception approvals for later review.
OWASP API Security Top 10	API5 — Broken Function Level Authorization	Integration permissions can expose powerful functions beyond the intended user need.
Recommendation — Authorize sensitive integration functions explicitly and review elevated access paths.
NIST CSF 2.0	PR.AA-05 — Least Privilege	The question is fundamentally about governance of access boundaries for integrations.
Recommendation — Enforce least-privilege approval for third-party app permissions and exceptions.

Practitioner Guidance

What to prioritise: Put every new integration through a permission-scope review before it is connected to production data. Treat high-risk scopes, especially read/write access to mail, files, admin functions, or customer data, as security decisions even when the business case is sound.

What to verify: Confirm who can approve the request, what exact scopes were granted, and whether there is a documented re-review trigger for scope changes, dormant apps, vendor changes, or business-owner change. If none of those exist, the control is too weak to trust.

Practitioner takeaway: Business teams can own the need for the integration, but security should own the permission boundary; otherwise, “approved” quickly becomes “implicitly trusted.”