Vendor security assessments expose the real governance gap in SaaS

At a glance

What this is: This is a vendor-security-assessment roundup that argues third-party risk should be treated as a continuous governance process, not a one-time onboarding step.

Why it matters: It matters because IAM, IGA, and security teams increasingly need to connect vendor risk scoring to access decisions, data exposure, and offboarding across both SaaS and machine identities.

By the numbers:

• 92% of organisations expose NHIs to third parties, raising concerns about supply chain security.
• 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface.

👉 Read Zluri's vendor security and privacy assessment software roundup

Context

Vendor security and privacy assessment tools are meant to reduce the gap between procurement review and real operational risk. In practice, that gap appears when onboarding decisions are based on questionnaires and certifications, but access, data handling, and privilege changes continue long after the initial approval.

For IAM and security teams, the core question is whether vendor assessment is connected to identity governance. If a third party can access sensitive systems, data, or SaaS integrations, then the assessment process is really an access-control problem with compliance evidence attached. That is why continuous review matters more than one-time scoring.

The article is typical of a broader category problem: organisations often manage vendor assurance as a documentation exercise instead of a lifecycle control. The useful lesson is not which tool is best, but how third-party risk, entitlement scope, and offboarding are tied together.

Key questions

Q: How should security teams assess third-party vendors without turning the process into paperwork?

A: They should anchor each assessment to actual access, data exposure, and privilege scope. Questionnaires and certifications are useful inputs, but they do not show whether a vendor can reach sensitive systems or retain access after the business need changes. The assessment should end with a control decision, not a score alone.

Q: Why do vendor assessments fail when they are only done at onboarding?

A: Because vendor risk is dynamic. Integrations change, permissions expand, contracts renew, and data sharing can continue after the original approval. If the process is only a gate at intake, organisations miss the period when third-party access becomes more dangerous than it looked on day one.

Q: What do organisations get wrong about security questionnaires?

A: They often treat questionnaire answers as proof of control effectiveness. In reality, a questionnaire only tells you what the vendor claims, not whether privileges are limited, access is revoked on time, or data handling matches the agreement. Evidence and runtime access review need to be linked.

Q: Who should own vendor offboarding when a supplier no longer needs access?

A: Accountability should sit with the team that approved the access, but enforcement must span procurement, security, and identity governance. Offboarding should include revoking credentials, closing integrations, and confirming data access has ended before the contract is considered complete.

Technical breakdown

Vendor security questionnaires versus continuous control evidence

Vendor questionnaires capture what a supplier says about its controls at a point in time. Continuous control evidence is different: it tracks whether those controls remain effective through audits, configuration changes, incidents, and contract renewal cycles. Security and privacy assessment software becomes more useful when it can ingest evidence automatically and trigger re-evaluation when risk changes. That distinction matters because paper compliance can lag operational reality by months.

Practical implication: tie vendor approval to recurring evidence collection, not static questionnaire completion.

Third-party access, data sharing, and entitlement scope

A vendor assessment only becomes identity-relevant when it is linked to what the third party can actually do. Read-only access, administrative privileges, and access to confidential data create very different blast radii. In IAM terms, the assessment should reflect entitlement scope, data sensitivity, and whether the vendor relationship can change without reapproval. Without that link, risk scores can look precise while actual exposure remains unknown.

Practical implication: map each vendor to the systems, data classes, and privilege levels it can reach.

Offboarding and reassessment as part of the vendor lifecycle

Third-party governance fails when onboarding is treated as the main event and offboarding is treated as an exception. Lifecycle management should cover access expiry, contract end dates, key revocation, and re-certification when the vendor’s role changes. The same principle applies to SaaS integrations and connected workflows, where dormant access often survives the business relationship that justified it. Mature programmes treat reassessment as a normal control, not a corrective action.

Practical implication: require offboarding checkpoints and access revocation triggers before contract closeout.

NHI Mgmt Group analysis

Vendor assessment is really identity governance in disguise. The article frames assessments as procurement support, but the operational issue is access, data handling, and privilege scope across external parties. That makes the problem closer to third-party identity governance than to document review. Practitioners should treat every vendor score as a proxy for entitlement risk, not a final answer.

Continuous monitoring matters because third-party risk changes after onboarding. Certifications and audit reports describe a prior state, while integrations, permissions, and exposed data can change daily. This is why static approval models fail to reflect real exposure. The implication is that vendor governance needs a recurring control loop, not a one-time gate.

Third-party access without lifecycle offboarding is the named failure mode here. Security review often focuses on admission, but the real exposure comes from access that outlives the business need. That assumption was designed for stable vendor relationships and scheduled review cycles. It fails when connections, permissions, and shared data persist beyond the contract. The implication is that vendor governance must be built around revocation, expiry, and revalidation as normal operating states.

Security questionnaires do not prove least privilege. A supplier can answer every control question correctly and still hold excessive access inside your environment. The article’s core limitation is that documentation quality is not the same as entitlement quality. Practitioners should align assurance artefacts with actual privilege models before trusting the result.

What this category signals is a convergence between GRC, SaaS management, and identity governance. Vendor risk tools are increasingly being used as a control point for access, compliance, and data-sharing decisions. That convergence is useful, but only if teams stop treating procurement evidence as a substitute for runtime governance. The field is moving toward lifecycle-based third-party control, not better forms.

From our research:

• 85% of organisations lack full visibility into third-party vendors connected via OAuth apps, according to The State of Non-Human Identity Security.
• 79% of organisations have experienced secrets leaks, with 77% of these incidents resulting in tangible damage.
• If third-party access is now part of your identity surface, start with the NHI Lifecycle Management Guide for governance, rotation, and offboarding discipline.

What this signals

Third-party governance is becoming an identity problem, not just a procurement one. The more vendors connect through SaaS, APIs, and OAuth-based integrations, the harder it becomes to separate contract risk from access risk. Organisations that already struggle with visibility should expect the assessment function to move closer to IAM and IGA operations, especially where external parties can read or modify data.

Vendor lifecycle control is the emerging blind spot. Once access is granted, reassessment, expiry, and revocation often lag behind the actual business relationship. The practical signal for programme owners is that vendor assurance needs to be event-driven, with identity changes feeding directly into review workflows.

The category is also converging with broader NHI governance. As connected services and machine access proliferate, teams need one control model that can reason about external vendors, service accounts, and delegated access in the same operational language.

For practitioners

• Link vendor review to entitlement scope Record which systems, datasets, and SaaS tenants each third party can reach, then require a fresh review whenever that scope changes.
• Require offboarding triggers for every vendor relationship Make access revocation, key expiry, and workflow shutdown mandatory steps at contract end, renewal failure, or role change.
• Separate compliance evidence from access approval Use audit reports and certifications as inputs, but do not let them replace a privilege review or data-sharing check.
• Reassess high-risk vendors on a fixed cadence Prioritise vendors with write access, customer data exposure, or privileged integrations for recurring reassessment instead of annual one-time approval.
• Track vendor risk changes alongside identity events Alert on new integrations, permission expansion, or ownership changes so the assessment process follows the actual identity surface.

Key takeaways

• Vendor security assessment tools help only when they are tied to actual access, not just documentation.
• The scale of the problem is third-party visibility and persistence, not questionnaire volume.
• Practitioners should treat offboarding, revocation, and reassessment as core controls in third-party governance.

Key terms

• Vendor security assessment: A vendor security assessment is the process of evaluating a third party’s control posture before and during a business relationship. It combines questionnaires, audit evidence, compliance status, and technical access review so teams can judge whether the vendor’s real exposure matches its claimed controls.
• Third-party identity governance: Third-party identity governance is the discipline of controlling what external vendors, partners, and suppliers can access, for how long, and under what conditions. It goes beyond procurement evidence and focuses on entitlement scope, lifecycle revocation, and continuous review of external access.
• Lifecycle offboarding: Lifecycle offboarding is the controlled removal of access, credentials, integrations, and data-sharing permissions when a relationship ends or changes. In vendor governance, it prevents access from outliving the business need that justified it and closes the gap between contract change and technical revocation.
• Entitlement scope: Entitlement scope is the exact set of systems, data, and actions an identity can reach. For vendors and other non-human identities, scope defines blast radius and determines whether a risk score reflects a minor read-only integration or a high-impact privileged connection.

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 governance in your organisation, it is worth exploring.

This post draws on content published by Zluri: Vendor Management 12 Vendor Security and Privacy Assessment Software for RFP issuers and responders. Read the original.