Third-party access management gaps are widening across hybrid estates

At a glance

What this is: This is a third-party access management explainer that argues external user access becomes a security and compliance risk when oversight, revocation, and monitoring are weak.

Why it matters: It matters because vendors, contractors, and partners now sit inside the identity perimeter, so IAM, PAM, and NHI programmes need lifecycle controls that work across all external access paths.

👉 Read Zluri's guide to third-party access management best practices

Context

Third-party access management is the governance layer that controls how vendors, contractors, and partners are granted, monitored, and removed from access to systems and data. In practice, the problem is not simply external access itself, but the failure to tie access to purpose, duration, and revocation across the full identity lifecycle.

For IAM teams, this is an NHI-adjacent governance problem as much as a third-party risk problem. External access often behaves like a service relationship rather than a human user relationship, which means approval, segmentation, auditing, and deprovisioning need to be treated as operational controls, not one-time onboarding tasks.

Key questions

Q: How should security teams govern third-party access in practice?

A: Security teams should govern third-party access as a lifecycle process, not a one-time approval. That means every external entitlement needs a business owner, a defined purpose, a fixed end date, and a reliable removal workflow. The goal is to prevent access from surviving longer than the work it supports, especially after projects, contracts, or partner relationships change.

Q: When does third-party access become a higher risk than it appears?

A: Third-party access becomes high risk when it is broad, difficult to monitor, or hard to revoke. A short-lived grant is still dangerous if the access path can reach sensitive systems, if the role is too coarse, or if offboarding depends on manual follow-up. The risk is not the existence of external access, but the inability to close it cleanly.

Q: What do organisations get wrong about third-party access reviews?

A: Many organisations review whether access was approved, but fail to verify whether it is still needed, still scoped correctly, or still tied to an active contract. That turns reviews into paperwork instead of governance. A useful review asks whether the external user still needs the access, whether the access is too broad, and whether revocation has actually happened.

Q: Who is accountable when a third party keeps access after the work ends?

A: Accountability should sit with the business owner who requested the access and the system owner who approved and enforced it. If revocation fails, the organisation has a governance problem, not just a technical one. Frameworks such as the NIST Cybersecurity Framework 2.0 expect access control and oversight to be measurable, not informal.

Technical breakdown

Why third-party access becomes an identity governance problem

Third-party access is different from ordinary employee access because the trust boundary is external and time-limited. The organisation is not just verifying identity at sign-in, it is deciding whether an outside party should hold a narrow slice of access for a defined task, then lose it cleanly when that task ends. That makes lifecycle governance, not just authentication, the core control plane. Once permissions outlive the work they were assigned for, access becomes standing exposure rather than managed collaboration.

Practical implication: treat third-party entitlements as lifecycle-managed assets with explicit start, end, owner, and approval records.

Why temporary access and revocation need automation

Temporary access only reduces risk when expiry is enforced automatically and revocation is reliable. Manual removal depends on human memory, ticket hygiene, and contract handoff quality, which makes it the weakest link in third-party governance. Automation matters because the real failure mode is not granting access, but forgetting to close it. If access must be tracked across projects, vendors, and application owners, the control needs to be embedded in the workflow, not delegated to follow-up.

Practical implication: use time-bound access with automatic expiry and workflow-driven deprovisioning rather than relying on manual offboarding.

How visibility, segmentation, and audits constrain third-party risk

Visibility tells you what an external user actually touched, segmentation limits what they can reach, and audits prove whether the access profile still matches business need. These controls work together because no single measure solves third-party risk on its own. Without monitoring, misuse can go undetected. Without segmentation, one excessive grant can expose too much. Without audits, access drift becomes normalised. The technical goal is to make external access observable, bounded, and reviewable across the full path of use.

Practical implication: combine logging, network or application segmentation, and recurring access reviews to keep third-party access within its intended boundary.

Threat narrative

Attacker objective: The objective is to reach sensitive systems or data through external access that was originally granted for a limited business purpose.

1. Entry begins when a vendor, contractor, or partner is granted access for a legitimate business task, often through a temporary or shared approval path.
2. Escalation occurs when that access is broader than the task requires, or when revocation fails and the outside user retains permissions after the work ends.
3. Impact follows when retained or excessive access is misused, accidentally leaks data, or creates a compliance failure that is hard to detect quickly.

Breaches seen in the wild

• LiteLLM PyPI package breach — LiteLLM PyPI supply chain attack, credentials stolen from users.
• Shai Hulud npm malware campaign — Shai Hulud campaign: npm malware exposed secrets on GitHub.

Read our 52 NHI Breaches Analysis report for a comprehensive view of breaches impacting Non-Human Identities including AI Agents.

NHI Mgmt Group analysis

Third-party access management is really lifecycle governance under an external trust boundary. The article is right to focus on requests, approvals, temporary access, and revocation because those are the control points that matter once outsiders need operational access. The discipline is not separate from IAM or PAM, it is IAM and PAM applied to non-employees with tighter expiry and review expectations. Practitioners should stop treating third-party access as an exception process and treat it as a governed identity class.

Manual revocation is the failure mode that turns temporary access into standing exposure. The article identifies revocation delays, missing oversight, and inconsistent controls as operational weaknesses, and that is the correct lens. If a third party can remain active after a project or contract ends, the organisation has not managed access duration at all. The implication is straightforward: access that cannot be removed reliably is already over-privileged in practice.

Third-party access control is an identity segmentation problem, not just a permissions problem. The article’s emphasis on limiting access, auditing activity, and separating systems reflects a deeper reality: outside users should never be able to move from narrow task access to broad environment reach. That is where RBAC alone is insufficient if roles are too coarse or if approvals are not tied to asset sensitivity. Practitioners should evaluate whether their access model can actually express vendor-specific boundaries.

External access should be measured by closure quality, not by grant volume. Many programmes report on how many third parties were onboarded, but the more important question is how many were cleanly offboarded on time and how many retained dormant access. That is where NIST CSF-style governance, access review discipline, and lifecycle controls intersect. If closure quality is weak, the programme is expanding risk while appearing operationally mature.

Third-party access is a leading indicator for broader machine and autonomous governance gaps. Organisations that cannot govern external human access cleanly will struggle even more when the access subject is a service account, token, or AI agent with similar temporary entitlements. The same lifecycle questions recur across human, NHI, and autonomous identity programmes. Practitioners should use third-party access as a test case for whether their governance model can handle non-employees at scale.

From our research:

• 91% of former employee tokens remain active after offboarding, leaving organisations vulnerable to potential security breaches, according to The 2025 State of NHIs and Secrets in Cybersecurity.
• 44% of NHI tokens are exposed in the wild, being sent or stored over platforms like Teams, Jira tickets, Confluence pages, and code commits.
• For a broader control view, the Ultimate Guide to NHIs sets out lifecycle, visibility, and revocation disciplines that map directly to external access governance.

What this signals

Third-party access programmes are only as strong as their offboarding discipline. If former employee tokens can remain active after departure, then external users can also outstay their business purpose unless revocation is automated and owned. The practical signal is whether the access model can prove closure, not just provisioning.

The next maturity step is to connect third-party governance to identity lifecycle evidence, audit trails, and exceptions management. That requires consistent review cadence and a clear distinction between a granted permission and a permission that is still justified. Teams should align this with the NIST Cybersecurity Framework 2.0 because the control outcome is measurable access governance, not policy language.

External access is becoming a proxy test for broader non-employee identity control. Organisations that can govern contractors and vendors cleanly are usually closer to being able to govern service accounts and AI-enabled workloads with the same rigor. The governance model has to move from approval counting to closure assurance.

For practitioners

• Define third-party access as a lifecycle-controlled identity class Create a separate approval, expiry, and ownership model for vendors, contractors, and partners so their entitlements are tracked from request through revocation.
• Automate expiry and deprovisioning for all external access Link every third-party grant to a time limit, a named business owner, and an automated removal workflow so access cannot outlive the task.
• Tighten segmentation around third-party task paths Limit external users to the smallest application, dataset, or environment slice needed for the engagement and prevent lateral movement into adjacent systems.
• Review dormant external entitlements on a fixed cadence Run recurring access reviews that focus on active third-party accounts, retained privileges after contract end, and exceptions that were never formally closed.

Key takeaways

• Third-party access becomes risky when lifecycle controls are weak, not simply because outsiders are involved.
• Revocation, segmentation, and auditing are the controls that prevent temporary access from becoming standing exposure.
• Identity teams should measure closure quality and access drift, because those signals reveal whether external access is truly governed.

Key terms

• Third-party access management: Third-party access management is the practice of controlling how vendors, contractors, and partners enter and use internal systems. It combines approval, limitation, monitoring, and removal so outside access remains tied to a specific business need and does not become lingering exposure after the work is complete.
• Access revocation: Access revocation is the process of removing permissions once they are no longer needed or justified. In third-party environments, it is the control that prevents temporary collaboration from turning into standing access, especially when contracts end, roles change, or a project closes without a clean offboarding step.
• Identity segmentation: Identity segmentation is the practice of limiting an identity to the smallest practical slice of systems, data, or applications. For third parties, it reduces blast radius by preventing a contractor or vendor account from moving freely across environments that are not part of the approved task scope.

Deepen your knowledge

NHI governance, agentic AI identity, and machine identity lifecycle are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are responsible for identity security strategy or NHI governance in your organisation, it is worth exploring.

This post draws on content published by Zluri: Access Management Third Party Access Management: All You Need To Know. Read the original.