IAM teams should use one lifecycle model for supplier access and machine identities, with discovery, ownership, review, and revocation linked together. That makes it easier to spot stale access, duplicate privileges, and forgotten integrations before they create a wider attack surface.
Why This Matters for Security Teams
Supplier accounts and machine identities often fail for the same reason: they accumulate access faster than anyone can review it. A vendor login, a service account, an API key, and a certificate may all support the same business process, yet each follows a different approval path and a different owner. That split creates blind spots, especially when access is handed off between procurement, IAM, and application teams. NHI Management Group’s guidance on the Ultimate Guide to NHIs — Key Challenges and Risks shows why this matters: non-human access is frequently over-privileged, under-reviewed, and hard to retire cleanly. The risk is not only misuse, but also dormant access that remains available after a supplier engagement ends or a workload is replaced. Current guidance from NIST Cybersecurity Framework 2.0 still points to governance, asset management, and access control as the right primitives, but teams have to apply them across both external and machine access paths. In practice, many security teams discover stale supplier access only after a forgotten integration or orphaned secret has already expanded the attack surface.
How It Works in Practice
The practical fix is to treat supplier access and machine identities as one governed population, then apply a shared lifecycle: discover, classify, approve, review, and revoke. That means every entitlement, secret, token, certificate, and service account is tied to a named business owner and a technical owner, with a recorded purpose and expiry condition. The goal is not just inventory. It is enforceable accountability.
A workable model usually includes:
- Central discovery across IAM, cloud, CI/CD, PAM, and secret stores so supplier and machine identities land in the same register.
- Ownership mapping that assigns one business sponsor and one technical custodian per identity or integration.
- Policy-based review windows that are shorter for elevated or externally facing access.
- Revocation workflows that remove access, rotate secrets, and disable dependent tokens together.
For machine identities, this is where short-lived credentials matter. The OWASP Non-Human Identity Top 10 reinforces that long-lived secrets and weak lifecycle controls are common failure points, while NHI Management Group’s 52 NHI Breaches Analysis shows how exposed credentials and forgotten access paths repeatedly lead to incidents. For suppliers, the same discipline works when paired with least privilege, time bounds, and removal triggers at contract end or tool decommissioning. Where possible, use JIT access for elevated actions and keep standing privileges near zero. Organisations should also align this with OWASP NHI Top 10 thinking, because modern integrations often behave like autonomous workloads once they are connected to toolchains and APIs. These controls tend to break down when supplier rights are embedded in application code or shared secrets are reused across multiple environments, because ownership and revocation no longer map cleanly to a single system.
Common Variations and Edge Cases
Tighter lifecycle control often increases operational overhead, so teams have to balance faster supplier onboarding against stronger containment. That tradeoff is especially visible in hybrid estates, where a vendor may need browser access, VPN access, API access, and cloud console access for the same service. Best practice is evolving here: there is no universal standard for how to express one approval model across all of those paths, but the direction is clear. Use the same policy intent, even if the enforcement point differs.
One useful pattern is to separate the approval of business need from the issuance of technical credentials. A supplier may be approved for a task, but the actual access should still be issued just in time, with short TTLs and automatic revocation. The same applies to machine identities that support third-party tooling, CI jobs, or agent-like automation. NHI Management Group’s Ultimate Guide to NHIs also highlights why secret sprawl and inconsistent ownership remain persistent issues, especially when teams store credentials in multiple platforms. Organisations should use Top 10 NHI Issues as a practical lens for recurring failure modes, then map those lessons to NIST Cybersecurity Framework 2.0 functions for continuous monitoring and access revocation. In the end, the model works best when supplier rights, machine identities, and secrets are all governed as one risk domain rather than three separate programs.
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 and risk surface, while NIST CSF 2.0 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Lifecycle gaps and long-lived secrets are central to this access problem. |
| NIST CSF 2.0 | PR.AC-4 | Least privilege and access governance fit shared review and revocation controls. |
| NIST AI RMF | Risk governance supports ownership and accountability for autonomous integrations. |
Use AI RMF governance to assign clear owners and lifecycle rules for agent-like machine access.
