How does NIS2 address supplier dependencies?
NIS2 extends accountability beyond the organization to its supply chain. Organizations must identify which suppliers are linked to critical or important services, assess the security posture of those suppliers, document the dependency relationship, and maintain ongoing oversight.
This applies to ICT service providers, cloud infrastructure, managed security services, and any vendor whose failure could impact the organization's ability to deliver essential or important services.
Key points
- Supply chain security is an explicit NIS2 requirement, not an optional extension. Organizations are accountable for dependencies they accept.
- Each supplier with critical service linkage requires a documented assessment: what service they support, what access they have, what security measures are in place, and what the fallback is.
- Supplier oversight must be ongoing. A one-time vendor assessment at contract signing does not satisfy continuous governance requirements.
- Where AI systems are provided by third-party vendors, supplier governance under NIS2 and vendor governance under GDPR/AI Act may overlap and should be managed together.
Why it matters
Many organizations rely on external vendors for critical infrastructure and AI capabilities. NIS2 makes explicit that the organization cannot outsource accountability for cybersecurity governance. If a supplier failure impacts an essential service, the organization — not the supplier — faces the regulatory consequences. Documented supplier oversight transforms this risk from unmanaged to governed.
How EAB approaches this
The NIS2 Readiness module structures supplier dependency documentation. Cybersecurity Governance links suppliers to the critical services they support. For AI-specific vendor governance, the Vendor Governance module connects GDPR processor requirements with AI Act provider documentation.