Vendor access management exposes the third-party identity gap

At a glance

What this is: This is a vendor access management guide arguing that third-party access should be tightly scoped, monitored, and revoked quickly.

Why it matters: It matters because vendor accounts are still governed like special cases in many IAM programmes, even though they behave like high-risk non-human identities with the same lifecycle and privilege problems.

By the numbers:

• 80% of identity breaches involved compromised non-human identities such as service accounts and API keys.
• Only 20% have formal processes for offboarding and revoking API keys, and even fewer have procedures for rotating them.
• 96% of organisations store secrets outside of secrets managers in vulnerable locations including code, config files, and CI/CD tools.

👉 Read Zluri's guide to vendor access management and third-party access controls

Context

Vendor access management is the set of controls used to grant, monitor, and revoke third-party access to internal systems. In practice, it sits at the intersection of IAM, PAM, and non-human identity governance because vendors often receive temporary credentials, elevated access, or shared accounts that behave like other machine identities.

The problem is that third-party access is still frequently treated as an exception rather than a governed identity class. That creates predictable gaps in visibility, lifecycle control, and revocation discipline, especially when external access is tied to business urgency rather than a clear offboarding process. This pattern is typical across mature and immature programmes alike.

Key questions

Q: How should security teams govern vendor access in production environments?

A: Security teams should treat vendor access as a privileged identity lifecycle, not a temporary convenience. That means scoping access to a named task, brokering credentials where possible, recording sessions, and assigning one owner for offboarding. Without those controls, third-party access becomes standing privilege in practice.

Q: Why do vendor accounts create more risk than ordinary user access?

A: Vendor accounts often combine elevated rights, weaker ownership, and inconsistent offboarding. They are frequently shared across staff, tied to time-limited work, and exempted from normal reviews, which makes them easier to overlook and harder to revoke. That combination widens the attack surface and increases the blast radius of compromise.

Q: What do teams get wrong about temporary third-party access?

A: Teams often assume that temporary access stays temporary after the business need changes. In reality, the highest risk is lifecycle drift, where credentials remain valid after the task ends, the contract changes, or the support window closes. Temporary access without enforced closure is still standing privilege.

Q: Who should be accountable when vendor access is no longer needed?

A: The accountable owner should be the business or system owner who approved the access, not the vendor or an informal operations queue. Access should end only when that owner confirms the task is complete and the entitlement is revoked. Accountability must be explicit enough to audit.

Technical breakdown

Why revocation discipline is the real control boundary

Revocation is where vendor access management succeeds or fails. If access persists after the task, contract, or incident window has closed, the organisation has converted temporary access into standing privilege. That is especially dangerous when the vendor relationship spans multiple internal teams, because no single owner may feel responsible for shutdown. The technical issue is lifecycle drift: the identity remains valid after the operational need has disappeared, which widens the blast radius of any later compromise.

Practical implication: make revocation an enforced lifecycle event, not an administrative follow-up.

Threat narrative

Attacker objective: The attacker wants durable third-party access that can be reused for unauthorized system access, data exposure, or lateral movement.

1. Entry occurs when third-party access is provisioned with broader rights than the vendor’s task requires, or when shared credentials are reused across multiple workers.
2. Escalation happens when the vendor session or credential is not tightly bounded, allowing lateral movement, privilege misuse, or access to adjacent systems.
3. Impact follows when access is not revoked on time, leaving a standing path that can be abused for data theft, account hijacking, or persistence.

Breaches seen in the wild

• Shai Hulud npm malware campaign — Shai Hulud campaign: npm malware exposed secrets on GitHub.
• Reviewdog GitHub Action supply chain attack — reviewdog/action-setup GitHub Action supply chain attack exposed secrets.

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

NHI Mgmt Group analysis

Vendor access management is really NHI governance by another name. The access pattern described in the article is not unique to vendors, because the same lifecycle and privilege problems appear in service accounts, API keys, and workload identities. The difference is organisational ownership, not technical nature. Practitioners should therefore manage external access as part of the broader non-human identity programme, not as a separate exception process.

Standing access is the failure mode this article exposes. The article’s own emphasis on temporary access, monitoring, and revocation shows that the core risk is not initial vendor onboarding but access that outlives its purpose. That is the same structural problem seen in many NHI compromises: the identity remains valid longer than the business need. Practitioners should read this as a lifecycle problem, not a tooling problem.

Revocation without ownership creates invisible privilege creep. When vendor access spans multiple teams, no one may own the final shutdown decision, and that is how temporary access turns into lingering entitlement. This is why governance must define who is accountable for offboarding, recertification, and exception closure. Practitioners should map vendor access to a named owner with a measurable end state.

Ephemeral trust debt: third-party access is often justified as temporary, but the organisation accumulates security debt every time access is approved without a deterministic offboarding path. That debt grows when access is renewed informally, shared across vendor staff, or tied to future work assumptions. The practical conclusion is simple: temporary access only stays temporary if lifecycle closure is enforced.

Third-party access should be measured as blast-radius exposure. The useful question is not whether vendors are trusted, but how much damage a compromised vendor credential could do before detection and revocation. That shifts the focus from convenience to containment. Practitioners should evaluate vendor access by reachable systems, session duration, and revocation latency.

From our research:

• 80% of identity breaches involved compromised non-human identities such as service accounts and API keys, according to Ultimate Guide to NHIs.
• 96% of organisations store secrets outside of secrets managers in vulnerable locations including code, config files, and CI/CD tools.
• For lifecycle depth and offboarding discipline, see NHI Lifecycle Management Guide and map vendor access to the same shutdown controls.

What this signals

Third-party access will keep collapsing into NHI governance. The more organisations rely on external vendors, the more they need one identity model for humans, contractors, and machine identities. If vendor credentials are not managed like other non-human identities, offboarding and review will remain inconsistent. The governance gap is structural, not cosmetic.

With 92% of organisations exposing NHIs to third parties, according to our Ultimate Guide to NHIs, vendor access management should be read as a supply-chain identity problem as much as an internal access problem. Teams that separate contractor access from broader identity governance will miss the common failure mode: entitlement that survives business need.

Temporary access only works when the lifecycle is deterministic. If approval, monitoring, and shutdown are not tied together, then a vendor session becomes residual privilege the moment the task ends. Practitioners should prepare for tighter offboarding evidence, stronger entitlement inventories, and a more explicit link between PAM and third-party governance.

For practitioners

• Classify vendor access as a governed identity type Map external accounts, shared vendor credentials, and remote support sessions into the same governance inventory used for service accounts and other non-human identities. Record owner, purpose, entitlement scope, and shutdown criteria so every vendor identity has a clear lifecycle end state.
• Eliminate shared vendor passwords Use brokering, managed credentials, or session-based access so third parties do not receive reusable standing secrets. If a vendor must authenticate directly, constrain the credential to one system, one task, and one approved support window.
• Enforce revocation as a control, not a request Tie offboarding to contract expiry, ticket closure, and access recertification so access cannot persist by assumption. Track revocation latency as a measurable control outcome and escalate any access that survives past its approved purpose.
• Record and review privileged vendor sessions Capture commands, navigation, and system actions for every high-risk external session, then review exceptions for evidence of lateral movement or unnecessary privilege use. Session visibility should be mandatory wherever vendors can reach production or sensitive data.

Key takeaways

• Vendor access management is fundamentally about preventing temporary third-party access from becoming standing privilege.
• The main control failure is lifecycle drift, where access remains valid after the vendor’s task, contract, or support need has ended.
• Organisations should govern external access with the same rigor they apply to other non-human identities: scope, visibility, and enforced revocation.

Key terms

• Vendor Access Management: Vendor access management is the governance process for granting, monitoring, and revoking external party access to internal systems. It combines identity lifecycle control, least privilege, session oversight, and termination discipline so third-party access does not outlive the business need it was created for.
• Standing Privilege: Standing privilege is access that remains valid without a current operational justification. In vendor environments, it often appears when temporary approvals are not tied to a reliable offboarding event, leaving the account usable long after the task, contract, or support window has ended.
• Managed Credentials: Managed credentials are centrally controlled secrets issued for a specific access path instead of being shared directly with the external user. They reduce password exposure, but they only create real security value when the credential is unique, tightly scoped, monitored, and retired on time.
• Third-Party Identity Lifecycle: Third-party identity lifecycle is the end-to-end handling of vendor accounts from approval through active use to revocation. It matters because external access often sits outside standard employee processes, so ownership, recertification, and shutdown must be explicit if the access is to remain temporary.

Deepen your knowledge

NHI governance, agentic AI identity, and machine identity security 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 identity governance in your organisation, it is worth exploring.

This post draws on content published by Zluri: Access Management Vendor Access Management: An Ultimate Guide. Read the original.