Managing Third Party And Open Source Risk In Software

🎯 CISSP Lens

Pick answers that align business risk, governance intent, and practical control execution.

Your software supply chain includes every component, library, tool, and service that ends up in or around your application.

Risks include:

• Known vulnerabilities in libraries and frameworks.
• Malicious or compromised packages.
• Abandoned components that no longer receive fixes.
• License terms that conflict with your obligations.
• Third party APIs that handle sensitive data poorly.

Managing this risk has both technical and governance parts.

Software composition and SBOMs

Software composition analysis tools:

• Scan your code and builds for known libraries and versions.
• Map them to vulnerability databases.
• Help you generate a software bill of materials (SBOM).

An SBOM is a structured list of components included in a piece of software. It lets you answer questions like "where do we use this vulnerable library" quickly.

Evaluating and approving components

Before adding a new library or SDK:

• Check its maintenance activity, release history, and community support.
• Review known vulnerabilities and responsiveness of maintainers.
• Confirm license terms are acceptable.
• Prefer well known, actively maintained projects over obscure ones.

For third party APIs and services:

• Assess their security practices and certifications where appropriate.
• Review how they handle data, logging, and incident response.
• Ensure contracts and SLAs reflect security expectations.

Ongoing monitoring

Risk does not end when you choose a component. You need:

• Regular SCA scans of key repositories.
• Alerts or reports when new vulnerabilities affect your components.
• Processes for prioritizing and applying updates.

📋 Domain cross-reference

📋 Domain cross-reference

Domain 8 expects you to:

• Recognize that third party and open source risk is part of software development security.
• Use SBOMs and SCA to gain visibility into components.
• Integrate vendor management, legal review, and technical controls.
• Prioritize structured processes over ad hoc decisions by individual developers.

In exam scenarios, look for answers that establish policies and systematic controls, such as approving components centrally, maintaining an inventory, and monitoring for vulnerabilities.

A popular open source logging library used by many applications in an organization is found to have a severe remote code execution vulnerability.

Teams initially have no idea where it is used or which versions are deployed. It takes days to gather this information manually.

After the crisis, the company implements:

• SCA on critical code bases, storing SBOMs for each release.
• A simple approval workflow for new libraries, focused on high risk areas.
• Subscription to vulnerability feeds that map to their SBOMs.
• Playbooks for responding to future component level incidents.

When a later issue affects a different library, they identify affected systems within hours and push updates much more quickly.

⚠️ Watch for this mistake: Allowing unrestricted use of any library or package without review.

⚠️ Watch for this mistake: Failing to track which components and versions are in use across applications.

⚠️ Watch for this mistake: Ignoring license obligations or assuming they are someone else’s problem.

⚠️ Watch for this mistake: Treating third party APIs as trusted simply because they are widely used.

⚠️ Watch for this mistake: Assuming cloud providers fully manage the security of all components you deploy.

• ✅ ✅ Run SCA on your most critical repositories and record the results.
• ✅ ✅ Start building SBOMs for key applications and tie them to releases.
• ✅ ✅ Establish simple guidelines for selecting new libraries, including minimum maintenance and security expectations.
• ✅ ✅ Ensure contracts for important third party services include security clauses and notification requirements for incidents.
• ✅ ✅ Subscribe to vulnerability alerts for your major components and plan how you will respond.
• ✅ ✅ Practice a mini supply chain incident drill, tracing one vulnerable library across your applications and simulating an update.

• 💡 💡 Most of your application is code you did not write, and you are responsible for its risk.
• 💡 💡 SCA and SBOMs provide visibility that is essential for managing vulnerabilities.
• 💡 💡 Governance, such as approval processes and vendor contracts, is as important as technical scanning.
• 💡 💡 CISSP Domain 8 expects structured management of third party and open source components.

📝 Exam practice

📝 Exam practice

A development team wants to add a new open source encryption library to a critical system. What should the security manager ensure before approving it.

Short answer: Confirm that the library is actively maintained, has acceptable licensing, has been reviewed for known vulnerabilities, and will be tracked in SBOM and SCA processes so future issues can be managed.