- Meaning
- The chain of suppliers, service providers and partners
- Risk
- Attacks and outages at partners reach through to your own organisation
- Relation to NIS2
- Supply chain security is a duty
- Related
- Third-party risk, data processing agreement
- Updated
- June 2026
- Editorial team
- Compliance Compass
What is the supply chain?
The Supply chain is the whole network of suppliers, service providers and partners an organisation depends on – from cloud and SaaS providers through IT service providers and managed service providers to software libraries and classic component suppliers. The term therefore describes the structure of your dependencies. In a modern organisation these links are tightly connected in digital terms: remote access, interfaces (APIs) and automatic software updates join external partners directly to your own systems. That connectedness is exactly what makes the supply chain an attack surface in its own right.
Why the supply chain is a risk
Attackers look for the weakest link in the chain and use it as a springboard to the real target, which is what a supply chain attack is. A single compromised provider can hit hundreds of customers at once, because its software or its access is in use at many organisations. On top of that come pure availability risks: if a central cloud provider goes down, your own operations may stand still as well – without any attack having taken place at all.
A typical case: A municipal utility buys its billing software from an external IT house that reaches the servers permanently through a maintenance connection. If that IT house is compromised through a stolen administrator login, the attackers travel down the trusted maintenance connection straight into the utility network – a classic supply chain attack, in which the gap was not the target itself but its service provider.
Securing the supply chain
The organisational answer to this structural risk is called Supply chain security: identifying and assessing the critical partners, anchoring security requirements in the contract (and, where personal data is processed, in a Data processing agreement (DPA)) and monitoring the Third-party risk of each individual service provider continuously instead of checking it only once.
The supply chain and NIS2
NIS2, which has applied since 18 October 2024 and binds you through the transposing law of your Member State, makes managing supply chain risks an express duty. Entities in scope have to account for the security of their direct suppliers and service providers themselves. Risk management has to take those dependencies in. Neglect can be expensive: Article 34 sets minimum ceilings of EUR 10 million or 2 % of total worldwide annual turnover for essential entities and EUR 7 million or 1.4 % for important entities, and Member States may set higher amounts.
Further reading: Directive (EU) 2022/2555 in full (EUR-Lex)
Frequently asked questions
What is the supply chain?
The supply chain is the whole network of suppliers, service providers and partners an organisation depends on – from cloud and SaaS providers through IT service providers and managed service providers to software libraries and classic component suppliers. It describes the structure of your digital and operational dependencies. Because these links are tied into your own systems through remote access, interfaces and automatic updates, the supply chain becomes an attack surface in its own right.
What is a supply chain attack?
A supply chain attack deliberately compromises a weaker link in the chain, a software or IT service provider for example, in order to reach the real target through the trusted access or the software updates that provider supplies. Because the same software or the same access is in use at many organisations, one compromised provider can hit hundreds of customers at once. The route of attack is not the target itself but the partner it trusts.
Why does the supply chain matter for NIS2?
NIS2 has applied since 18 October 2024 and obliges entities in scope expressly to assess and steer the risks arising from their direct suppliers and service providers and to bring them into their own risk management. Neglect can be expensive: Article 34 sets minimum ceilings of at least EUR 10 million or 2 % of total worldwide annual turnover for essential entities and at least EUR 7 million or 1.4 % for important entities, and Member States may set higher amounts.