Vendor onboarding often moves quickly. Procurement teams need to secure services, software, and suppliers without creating delays that affect operations. At the same time, security teams need enough information to understand whether a new vendor could introduce cyber risk.
A practical way to balance both needs is to begin with the supplier’s external attack surface. This means reviewing the systems, domains, services, and public-facing infrastructure that can be observed from outside the organization.
The objective is not to treat every vendor as high risk or to replace a full security assessment. Instead, it is to identify early signals that help teams decide how much review is appropriate.
An initial external assessment can focus on a few useful areas:
- Public domains and subdomains associated with the supplier
- Internet-facing services and exposed infrastructure
- Email security controls, such as SPF, DKIM, and DMARC
- Expired certificates, unused domains, or outdated public services
- Known technology indicators that may require validation
- Signs of unmanaged or forgotten digital assets
These findings should always be interpreted in context. A small marketing vendor may require a lighter review than a supplier that handles customer data, connects to internal systems, or supports a critical business process.
The most effective process combines speed with prioritization. Low-risk suppliers can move through a streamlined review, while higher-impact suppliers receive deeper technical validation, contractual controls, or additional security questions.
This approach helps procurement and security teams work from the same evidence. Procurement gains a clearer path for moving forward, while security gains visibility into the external risks that could affect the organization.
The goal is simple: make better vendor decisions earlier, without slowing down the business unnecessarily.
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