Your Cybersecurity Is Only as Strong as Your Suppliers

When most organizations think about cybersecurity, they focus on protecting their own networks, systems, and employees. But increasingly, cyber criminals are finding another way in: through your vendors.

Whether it’s a software provider, equipment manufacturer,cloud service, payroll processor, or logistics partner, third parties often have access to your systems, data, or operations. And if one of those organizations suffers a cyber incident, your business could feel the impact.

This growing challenge is known as third-party risk,and it’s becoming one of the most significant cybersecurity concerns facing organizations today.

Why Third-Party Risk Matters

Modern businesses rely on an ecosystem of partners and suppliers to operate efficiently. That connectivity delivers tremendous value,but it also creates new opportunities for attackers.

Consider how many external organizations may interact with your business:

• Cloud software providers
• Equipment manufacturers and service technicians
• Managed IT service providers
• Shipping and logistics partners
• Payment processors
• Marketing agencies
• Human resources and payroll platforms

Each relationship introduces some level of cyber risk. Attackers understand that vendors are often the path of least resistance. Rather than targeting a large organization directly, they may target a smaller supplier with weaker security controls and use that access to reach their ultimate target.

Supply Chain Attacks Are on the Rise

Some of the most significant cyber incidents in recent years have involved trusted third parties. In these attacks, organizations weren’t breached because their own defenses failed — they were impacted because a supplier, software provider, or service partner was compromised.

The lesson is simple: Your cybersecurity program must extend beyond your own walls.

For PMMI Members, this is especially important as manufacturing environments become increasingly interconnected through cloud platforms, remote service and support tools, industrial IoT devices, and integrated supply chains.

Questions Every Organization Should Ask

You don’t need to perform a detailed audit of every vendor, but you should understand the risks associated with those that have access to critical systems or sensitive data.

Start by asking

• What vendors have access to our systems?
• What data do they handle?
• Do they have remote access into our environment?
• How do they protect customer information?
• What would happen if they experienced a cyber incident?

If you don’t know the answers to these questions, that’s a good place to begin.

Practical Steps to Reduce Third-Party Risk

Managing third-party risk doesn’t have to be complicated. Start with knowing who your vendors are by creating an inventory of vendors that have access to your data, systems, or facilities. You can’t manage risks you don’t know exist.

Prioritize High-Risk Relationships

Not all vendors present the same level of risk. A company managing your payroll data deserves more scrutiny than a vendor providing office supplies. Focus your attention where the potential impact on your business is the greatest.

Review Security Expectations

For key vendors, ask basic questions about their cybersecurity practices:

• Do they limit access only to those who need it and to the minimum level required to fulfill their obligations?
• Do they use multifactor authentication?
• Do they conduct security awareness training?
• Do they have an incident response plan?
• Have they experienced recent security incidents?

You don’t need to become an auditor; you just need to gain an understanding of their security maturity.

Control Vendor Access

Provide vendors only the access they need and remove it when it’s no longer required. This principle of least privilege applies to third parties just as much as it does to employees.

Plan for Vendor Incidents

Ask yourself: what happens if one of our critical suppliers is compromised tomorrow? Having a plan before an incident occurs can significantly reduce disruption when something goes wrong.

The Bottom Line

Cybersecurity is no longer just about protecting your own organization; it’s about understanding and managing the risks that come from the broader ecosystem of partners, suppliers, and service providers that help your business operate. For PMMI Members, third-party risk management doesn’t require a massive investment or dedicated team; it starts with awareness, visibility, and asking the right questions.

Want to learn more about assessing vendor cybersecurity risk or creating a simple supplier risk review process? Contact us at cyberhealth@pmmi.org.