How should organisations govern external users in SaaS environments?

Treat external users as first-class identities with named ownership, approved scope, and a defined offboarding path. Contractors, MSPs, and vendors should be reviewed on a regular cycle and removed when the engagement ends. If they are not in lifecycle governance, they will usually remain in the access model far too long.

Why This Matters for Security Teams

External users are not just “third parties” in a SaaS tenant. Contractors, MSP staff, and vendors often sit inside the same collaboration, support, and admin pathways as employees, which means weak lifecycle controls quickly become a standing access problem. NHI Mgmt Group’s Ultimate Guide to NHIs shows that 92% of organisations expose NHIs to third parties, and only 20% have formal offboarding and revocation processes. That gap matters because SaaS access frequently outlives the contract, the ticket, or the business need.

Security teams also underestimate how quickly externally managed access becomes opaque. Once a vendor is granted collaboration rights, delegated admin, or API access into SaaS tools, ownership can blur across IT, procurement, and business ops. Current guidance suggests treating that access as a governed identity lifecycle, not a one-time approval. The control objective aligns with broader identity discipline in the NIST Cybersecurity Framework 2.0, where access management, accountability, and recoverability are part of operational resilience. In practice, many security teams encounter exposure only after a vendor relationship ends but the access does not.

How It Works in Practice

Effective SaaS governance starts by classifying external users by business function, not by informal labels like “partner” or “guest.” Each external identity should have a named internal owner, a documented purpose, and a bounded entitlement set that reflects the smallest workable scope. For example, a support vendor may need case visibility but not export permissions, while a systems integrator may need temporary admin rights only during deployment.

Lifecycle controls should then be enforced through workflow, not memory. A practical model includes:

• pre-approval tied to contract or work order
• time-bounded access with explicit expiry dates
• periodic recertification by the business owner
• automatic removal when the engagement ends
• log review for privileged or anomalous activity

That approach is consistent with the lifecycle emphasis in Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs and the incident patterns documented in the Snowflake breach, where identity and access scope became part of the attack path. For SaaS, this also means deciding whether the external party should use a named account, a federated identity, or a shared administrative workflow. Best practice is evolving, but shared accounts should be avoided wherever possible because they destroy accountability and make offboarding unreliable. These controls tend to break down when SaaS tenants allow delegated administration across multiple business units because ownership and revocation authority become fragmented.

Common Variations and Edge Cases

Tighter external-user governance often increases operational overhead, requiring organisations to balance fast partner onboarding against stronger review and removal discipline. That tradeoff is most visible in SaaS environments that support customer success teams, implementation partners, and managed service providers, where access needs change frequently and the business wants low-friction collaboration.

There is no universal standard for this yet, but current guidance suggests different handling for different external populations. Vendors with administrative access should usually be placed under stronger approval, shorter TTLs, and more frequent recertification than read-only collaborators. Regulators and auditors will also expect clearer evidence for why access exists, who approved it, and when it was removed; the Ultimate Guide to NHIs — Regulatory and Audit Perspectives is useful here. For incident-prone environments, the Top 10 NHI Issues also reinforces why dormant access and weak revocation remain recurring failure modes. Where SaaS vendors require support access with persistent tokens, controls often fail because the access path is outside the organisation’s direct lifecycle tooling.

Related resources from NHI Mgmt Group

• How should security teams govern non-human identities in cloud environments?
• Should organisations prioritise external exposure or internal credential governance first?
• What do organisations get wrong about SaaS procurement and access control?
• What do organisations get wrong about unused SaaS licenses?