How Your Suppliers Become Your Biggest Cyber Risk
In today’s increasingly complex business ecosystems, suppliers and subcontractors often represent a digital Achilles' heel: vulnerable, creating a false sense of security, and frequently overlooked. Why force the front door when you can slip in through an unknown back entrance? Supply chain security isn't optional - it's essential.
Author: Renee van der Post
The Supply Chain: Bigger and More Invisible Than You Think
Where companies once worked with a handful of local partners, modern supply chains are international and complex. A software vendor might use hosting services from another country, which in turn sources hardware from different regions.
In our globalized economy, supply chains are often so branched out that no one has a complete overview of everyone involved. This creates a network of dependencies stretching across multiple countries, time zones, and jurisdictions, making visibility difficult and security complex.
While cybercriminals cleverly exploit these networks, organizations often place blind trust in their partners without systematically verifying if security is taken as seriously there as it is in-house.
Imagine you're a mid-sized e-commerce player. Your marketing team uses a popular email tool for campaigns. This tool is built by an American software company, which in turn outsources its hosting to an Asian cloud provider. If that cloud provider falls victim to a data breach, hackers could gain access to your company's entire customer list.
A Crisis of Trust
What begins as an incident on the other side of the world can end as a crisis of trust with your customers right here at home—long before you even knew something was wrong. Your own cybersecurity may have been in order, but the attack occurred somewhere deep within your digital supply chain.
Even When You Do Everything Right
We don't have to look far back in time to see how supply chain attacks can bring down organizations. In 2020, SolarWinds was hit by a large-scale attack where assailants gained access to the networks of thousands of companies and government agencies worldwide. The attack went undetected for months and led to severe data breaches at U.S. government departments and major tech companies, among others.
The MOVEit hack in 2023 also had far-reaching consequences: thousands of organizations fell victim to a data breach without having done anything wrong themselves. In early 2025, a major retailer was temporarily crippled when its logistics software supplier was hit; stores could no longer process payments, and customers were literally left standing in front of closed doors.
These incidents have one thing in common: the attack didn't start with the affected company itself, but with a partner in their supply chain.
Supply Chain Resilience Starts with Insight
True digital resilience doesn't just come from implementing more technological measures within your own company, but from gaining insight into your entire supply chain. Which parties have access to your data? Who do they work with? And what agreements have been made regarding security and incidents?
Set concrete requirements for your suppliers. Consider enforcing a minimum security standard (like ISO 27001), requesting recent audit results, or implementing a joint incident reporting procedure. Organize regular meetings or supply chain sessions to discuss risks—not to point fingers, but to become stronger together. Furthermore, the NIS2 directive sets explicit requirements for managing supply chain risks, making this not only a wise practice but, in many cases, a legal obligation.
As Strong as Your Weakest Link
Cybersecurity doesn't stop at your front door, nor does it end with your suppliers. Supply chain security is therefore no longer a luxury, but a necessity. Not to eliminate every single risk—that's impossible—but to ensure you aren't unknowingly bringing a ticking time bomb into your organization. At Defenced, we help organizations make their supply chain transparent and resilient. From rapid assessments to structural monitoring, together we ensure you no longer have a blind spot. Curious about the state of your supply chain?
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Sources:
¹ Cybercrime Trends Survey (2024)
² Wired – MOVEit Data Breach (2023)
³ Nu.nl – SolarWinds hack (2020)
⁴ The Guardian – Marks & Spencer cyberaanval (2025)