How should organisations govern third-party identity access more tightly?

Why This Matters for Security Teams

Third-party access is rarely risky because of a single bad account. The problem is usually accumulation: dormant vendor users, overbroad support roles, shared credentials, and tokens that outlive the work they were issued for. NHI governance has to treat these access paths as privileged infrastructure, not a lightweight extension of procurement. That is especially important because third parties often connect through API keys, service accounts, and automation tokens that are harder to monitor than human logins.

NHIMG research shows the scale of the issue. In the Ultimate Guide to NHIs, 92% of organisations expose NHIs to third parties, which broadens the attack surface and complicates accountability. The same guide also notes that only 20% of organisations have formal processes for offboarding and revoking API keys, which is exactly where third-party access often fails. That gap matters because vendor access typically spans business, technical, and contractual boundaries, so no single team sees the full lifecycle.

Practically, this is where incidents often emerge after access has already drifted beyond its original purpose, rather than through deliberate approval and review.

How It Works in Practice

Tighter governance starts with ownership and scoping. Every third-party identity should map to a named internal owner, a business justification, a time limit, and a clearly defined set of entitlements. The access request should specify what the third party may do, which systems are in scope, and what evidence proves the relationship still exists. That is the minimum standard for both human vendor users and non-human vendor automation.

Security teams usually get better outcomes when they pair NIST Cybersecurity Framework 2.0 with an identity-centric review model and then enforce the result through PAM and RBAC. For vendor automation tokens, the best practice is evolving toward JIT issuance, short-lived secrets, and automatic revocation at task completion. Current guidance suggests treating these tokens as ephemeral workload credentials, not as reusable shared passwords. That means rotating secrets on a schedule, binding them to specific systems or APIs, and logging every privilege change.

• Use least privilege by default, then narrow access further for production, admin, and break-glass use.
• Require expiry dates on every third-party entitlement, including support accounts and API tokens.
• Run periodic recertification with business owners, not just IT, so access is validated against actual need.
• Revoke immediately when the contract ends, the role changes, or the integration is retired.
• Track vendor automation separately from human vendor users, because their risk profile and audit evidence differ.

The control model should also reflect what OWASP Non-Human Identity Top 10 highlights about secret misuse, overprivilege, and weak lifecycle management. For deeper context on how these failures show up in real environments, review NHIMG’s 52 NHI Breaches Analysis and the Top 10 NHI Issues. These controls tend to break down when vendors insist on shared administrative credentials across multiple customer environments because accountability and revocation become indistinct.

Common Variations and Edge Cases

Tighter third-party control often increases operational friction, so organisations have to balance speed against containment. That tradeoff is real for managed service providers, outsourced support desks, and software suppliers that need broad technical reach to resolve incidents quickly. The answer is not to remove friction entirely, but to make elevated access temporary, attributable, and reviewable.

There is no universal standard for every edge case. For example, emergency break-glass access may need a longer approval path reduction, but it should still be time-bound, logged, and reviewed after use. Likewise, some integrations require machine-to-machine access that looks like a vendor account but behaves like internal automation. In those cases, governance should follow workload identity principles and secret hygiene rather than human joiner-mover-leaver processes.

NHIMG’s Ultimate Guide to NHIs — Key Challenges and Risks is useful here because it frames lifecycle weaknesses as a systemic issue, not a one-off configuration mistake. That perspective aligns with NIST Cybersecurity Framework 2.0 and the broader NHI governance lessons in the Ultimate Guide to NHIs. For teams with complex vendor ecosystems, current guidance suggests documenting exception handling separately so temporary access does not quietly become standing privilege.

Related resources from NHI Mgmt Group

• How should security teams govern non-human identities that have persistent access?
• How should security teams govern API keys used for generative AI access?
• How should security teams govern third-party AI agents that use OAuth access?
• How should security teams govern non-human identities at scale?