Common Challenges in Managing Third-Party Risks

Managing third-party risks is one of the most underappreciated challenges in modern security programs. Organizations rely on dozens, sometimes hundreds, of vendors, suppliers, and service providers. Each one represents a potential entry point into your environment. The tricky part is that you often have limited visibility into what those vendors are actually doing with your data or how well they protect their own systems.

This post walks through the most common challenges organizations face when managing third-party risks and offers practical strategies to address them. This topic maps to CompTIA Security+ Exam Objective 5.3 under Security Program Management and Oversight.

Why Third-Party Risk Is So Difficult

Before diving into specific challenges, it helps to understand the core problem. When you manage your own infrastructure, you control the policies, patch cycles, access controls, and monitoring. With third parties, you hand over some of that control. You are trusting that the vendor's security posture is at least as strong as your own, and that trust often goes unverified.

High-profile breaches like the SolarWinds attack demonstrated that even sophisticated organizations can be compromised through a trusted vendor relationship. That event changed how many security teams think about supply chain risk.

Common Challenges in Vendor Risk Management

1. Lack of Visibility Into Vendor Security Practices

Most organizations do not have direct insight into a vendor's internal security controls. You might know they passed a SOC 2 audit last year, but you do not know if they patched a critical vulnerability last month.

What to do: Require vendors to provide up-to-date attestations, certifications, or audit reports. Use questionnaires like the SIG Lite (Standardized Information Gathering) as a baseline. For high-risk vendors, consider contractual rights to audit.

2. Inconsistent Risk Assessment Processes

Many organizations assess new vendors at onboarding and then never revisit the assessment. A vendor that was low-risk two years ago may now have access to much more sensitive data or may have experienced a breach themselves.

What to do: Implement a tiered vendor classification system. Categorize vendors as critical, high, medium, or low based on data sensitivity and access levels. Then set reassessment frequencies accordingly. Critical vendors might be reviewed annually or after any significant incident.

3. Vendor Sprawl

As organizations grow, the number of third-party relationships often explodes. Keeping track of every SaaS tool, cloud provider, contractor, and supplier becomes overwhelming fast.

What to do: Build and maintain a vendor inventory. A simple spreadsheet works as a starting point, but mature programs use dedicated third-party risk management (TPRM) platforms. The key is knowing who your vendors are before you can assess them.

4. Weak Contractual Protections

Security requirements are sometimes vague or missing entirely from vendor contracts. If a vendor experiences a breach and there is no contractual obligation to notify you within a specific timeframe, you may not hear about it for weeks.

What to do: Work with legal and procurement to include clear security language in contracts. This should cover breach notification timelines, right-to-audit clauses, data handling requirements, and acceptable use policies. Reference frameworks like NIST SP 800-161 for supply chain risk management guidance.

5. Fourth-Party Risk

Your vendors have their own vendors. These are sometimes called fourth parties or nth parties. If your payroll provider uses a subcontractor to process data, that subcontractor is now part of your risk picture, even though you have no direct relationship with them.

What to do: Ask vendors to disclose key subprocessors and require them to hold their own supply chain to reasonable security standards. Some organizations include flow-down requirements in contracts, meaning the security standards you require of your vendor must also apply to their subcontractors.

6. Resource Constraints

Thorough vendor risk management takes time and dedicated personnel. Many security teams are already stretched thin, and adding formal third-party risk management feels impossible.

What to do: Start small and scale. Focus initial efforts on your most critical vendors. Use standardized questionnaires and automated scoring tools to reduce manual effort. Building a repeatable process is more valuable than a perfect but unsustainable one.

Building a Culture of Shared Responsibility

Third-party risk management is not just a security team function. Procurement, legal, IT, and business owners all play a role. Security issues that originate through vendors often happen because someone in the business signed up for a new tool without involving security at all. Creating clear intake processes and making it easy for teams to engage security early helps close that gap.

What's Next

Now that you understand the common challenges in managing third-party risks, the next step is exploring how organizations formalize these efforts through vendor agreements, due diligence frameworks, and ongoing monitoring programs. We will also look at how risk management ties into broader governance structures covered throughout Security+ Domain 5. Stay with us as we continue building out this part of the exam.

For deeper study on this topic, the CompTIA Security+ Study Guide by Mike Chapple and David Seidl covers vendor and supply chain risk in clear, exam-focused detail.