Vendor risk covers suppliers you pay. Third-party risk is wider and adds partners, contractors, open source and anyone else with access or influence. Supply chain risk is widest: it follows the products and services you acquire back through how they were built and delivered, including suppliers of your suppliers.
Definitions side by side
| Term | Core idea | Typical scope |
|---|---|---|
| Vendor risk | Risk from companies you buy from | Contracts, questionnaires, reviews |
| Third-party risk management (TPRM) | A program covering any outside party with access to your data, systems or operations | Vendors, partners, contractors, service providers |
| Cybersecurity supply chain risk management (C-SCRM) | Managing risk across acquired products and services and how they are produced | Software, hardware, services, upstream suppliers |
NIST frames the last of these as identifying, assessing and mitigating risks tied to the products and services an organization acquires, and notes that limited visibility into how technology is built and deployed is a core problem. Its guidance is published as SP 800-161 Rev. 1; confirm the current revision on the NIST page.
Where they overlap
Most day to day work is the same: inventory, tier, collect evidence, decide, review. The difference is in what you consider to be a supplier.
- A vendor program usually starts from the finance list.
- A third-party program adds people and organizations that are not on the finance list, such as contractors or integration partners.
- A supply chain program also looks inside the product: libraries, build systems, update channels and hardware.
Examples
- A payroll provider is a vendor, a third party and part of your supply chain.
- A contractor with repository access is a third party. They may not be a vendor in your procurement system.
- An open source library in your product is a supply chain concern. There is no vendor contract, and no one to send a questionnaire to.
- The company that supplies a component to your vendor is a fourth party. See fourth party risk explained.
Which term should you use?
Use the one that matches the scope of your program. If you only review paid SaaS, call it vendor risk. If you also cover contractors and open source, third-party or supply chain risk describes the work more truthfully. The label matters less than being clear about what is in and out.
A starting point if you cover all three
- Build one inventory with a type column: vendor, contractor, open source, hardware.
- Use one tiering scheme across types.
- Match the method to the type: contracts and questionnaires for vendors, access reviews for contractors, maintainer and release checks for open source.
- Review them in one forum so decisions line up.
See what a vendor risk assessment is and how to run one for the method.
Quick check
Is open source a vendor?
Not in the contractual sense, but it is a supplier in the supply chain sense. Assess it by maintainers, release practice and your ability to replace it.
What is the difference between TPRM and C-SCRM?
TPRM focuses on outside parties with access or influence. C-SCRM adds how acquired products are built and delivered. In practice programs combine them.
Safeguard's SBOM and dependency scanning covers the open source and component side of supply chain risk, and a free scan is at gold.safeguard.sh/scan.
Sources
Last reviewed: 19 October 2026.
