Tips to Address Third-Party Security Risks in Your SME

Third-party security risk has become one of the most difficult risks for any business to control. As your company grows or starts working with third-party services, your security extends beyond internal systems and becomes closely linked to the practices of your vendors.

A recent survey of 546 IT directors and CISOs by cyber security ratings vendor Security Scorecard found that 71% of organizations experienced at least one third-party cyber security incident in the past year, with 5% reporting ten or more such incidents. This high frequency of third-party incidents shows how vendor security weaknesses are no longer isolated events. A breach at one of your vendors can directly affect your organization and extend further to the customers and partners who rely on the services you provide.

In this blog, you’ll find nine practical and strategic tips to help you strengthen third-party security and reduce risk exposure across your vendor ecosystem.

Where to Start With Third-Party Security

Managing third-party security can feel overwhelming, especially when your business depends on multiple vendors to operate efficiently. The key is not to tackle everything at once, but to take a structured, practical approach that focuses on visibility, control, and consistency. The following tips break third-party security into manageable actions you can apply gradually, helping you reduce risk without disrupting day-to-day operations.

1. Build A Clear List of All Your Third Parties

The first step in managing risk is knowing who is part of your ecosystem. Many SMEs rely on more third parties than they realise—SaaS apps, freelancers, hosting providers, marketing agencies, logistics partners. Creating an accurate vendor list helps you understand your exposure, identify hidden dependencies and establish a foundation for stronger oversight.

2. Classify Vendors Based on Their Risk Level

Not all vendors pose the same level of risk, and risk should always be assessed in the context of your organization’s objectives. A vendor becomes high risk when their access or services can negatively affect the confidentiality, integrity, or availability of your information or systems. By classifying vendors as high, medium, or low risk based on this impact, SMEs can focus limited resources on the relationships that matter most to data security and business continuity.

3. Perform Practical Security Checks Before Trusting a Vendor

Start by asking vendors a set of basic security questions to understand their security posture. Questions around the use of multi-factor authentication, data protection practices, and incident response processes can quickly indicate how seriously security is treated. Based on the level of risk and the criticality of the vendor, you can then decide whether deeper reviews or technical assessments are required. Vendors with mature security practices are usually transparent and clear in their responses, while vague answers often highlight areas that need closer attention.

4. Strengthen Contracts with Clear Security Expectations

A well-written contract helps set clear expectations and accountability between your SME and its vendors. Including basic clauses on data confidentiality, breach notification timelines, and access management creates a shared understanding of security responsibilities. This clarity at the contract stage supports better communication and reduces confusion when a security incident occurs.

5. Continuously Monitor Vendor Performance and Changes

Risk evolves over time as vendors change tools, adopt new technologies, or modify their internal processes. Regular check-ins help SMEs keep pace with these changes. Monitoring does not need to be complex; periodic reviews of vendor access, scheduled reassessment of vendor risk levels, confirmation of continued security controls, and annual updates to security documentation are common practices that can significantly reduce third-party risk. 

6. Limit Vendor Access and Follow Strict Privilege Controls

Excessive access is one of the biggest vulnerabilities SMEs often overlook. Vendors are often granted broad permissions that remain active long after a project ends. Adopting the principle of least privilege—giving vendors only the access they need, only for the duration required—removes unnecessary entry points that attackers frequently exploit.

7. Prepare for Vendor-Related Disruptions

Even with strong controls, vendor incidents can still impact your business. Understanding how each vendor communicates during incidents, knowing which internal processes depend on them and preparing fallback options builds resilience. Being prepared ensures your SME continues operating even if a critical vendor faces a breach or outage.

8. Limit the Data You Share to the Bare Minimum

Every piece of data shared with a vendor increases your exposure. To minimize risk, it’s important to share only the minimum required information. This approach helps reduce the potential impact if a vendor experiences a breach. 

9. Educate Employees About Vendor Risks

Employees directly influence your third-party risk posture. They are the ones signing up for tools, sharing documents externally or granting access to freelancers. Training them to understand what data can be shared, how to request approval for new tools and why vendor access must be controlled ensures that your internal teams don’t inadvertently expand your exposure.

Building a Cyber Resilient SME Through Better Vendor Oversight

Strengthening third-party security is essential for protecting your SME. Your organization’s safety depends not only on your internal controls but also on the practices of every vendor you work with. While these risks are increasing, they can be managed effectively with the right approach.

Vendor risk management does not need to be perfect on day one. By starting small—mapping vendors, classifying them, assessing risk realistically, setting clear contractual expectations, controlling access, and educating employees—your SME can significantly reduce third-party exposure. The aim is not to eliminate risk entirely, but to manage it with awareness and preparedness. By taking charge of your third-party ecosystem, you strengthen your business and help protect its future.