Secure software development requires more than writing secure code. Modern applications depend on third-party libraries, open-source components, development tools, CI/CD pipelines, code repositories, and infrastructure that can introduce security risks outside the application itself.
Developers need to understand and manage security across the entire software ecosystem—from development environments and dependencies to build pipelines and deployment.
Security training that focuses only on coding vulnerabilities can leave teams unprepared for attacks targeting these surrounding systems.
Key Takeaways
- Secure development requires protecting code, credentials, tools, dependencies, pipelines, and infrastructure.
- Third-party and open-source components can introduce software supply chain risk.
- A Software Bill of Materials (SBOM) helps teams understand which components are included in their software.
- Secure CI/CD practices can reduce the risk of dependency confusion, poisoned packages, and compromised build tools.
- Developers need clear incident response procedures and practical experience responding to security events.
What Is Third-Party and Infrastructure Security Risk?
Third-party and infrastructure security risk is the security exposure created by the external components, tools, platforms, dependencies, and systems that support software development and deployment.
These risks can exist in:
- Open-source libraries
- Third-party frameworks
- Developer workstations
- Plugins and extensions
- Source code repositories
- Package repositories
- Build automation
- CI/CD pipelines
- Credentials and secrets
- Deployment infrastructure
A developer may write secure application code while still working within an environment that exposes the application to compromise.
Secure code is only one part of secure software. The systems that build, manage, and deploy that code must also be protected.
Why Do Developers Need to Understand Infrastructure and Supply Chain Security?
Attackers can target the systems surrounding an application instead of attacking its source code directly.
Development environments can provide access to sensitive assets such as source code, credentials, repositories, and build systems. Third-party dependencies can introduce vulnerable or compromised components. CI/CD tools can provide a path for tampering with software before it reaches production.
These risks are increasingly recognized as core application security concerns. The OWASP Top 10 2025 includes Software Supply Chain Failures as a major risk category, reinforcing the need to protect not only application code but also how software is built, tested, configured, and deployed.
Who Does This Help?
Training in third-party and infrastructure security is especially relevant for:
- Software developers
- Application security teams
- DevOps and DevSecOps teams
- Engineering organizations
- Security teams responsible for software supply chain risk
- Teams managing CI/CD pipelines and development infrastructure
How Can Developers Secure Their Development Environments?
Securing the development environment starts with awareness, access control, and disciplined security practices.
Developers should use secure, enterprise-managed devices and protect credentials using approved password managers or credential vaults. Unverified plugins and extensions should be avoided because they can introduce vulnerabilities or unauthorized access.
Access to version control systems should also be carefully controlled, with protections such as two-factor authentication helping reduce the risk of account compromise.
For cloud-based development workflows, organizations should also consider how to establish a secure cloud development environment (CDE) that protects the tools, dependencies, configurations, and systems developers use to build software.
Development Environment Security Checklist
Developers should be trained to:
- Use approved, enterprise-managed development devices.
- Protect credentials using secure password managers or vaults.
- Avoid installing unverified plugins, packages, or extensions.
- Restrict access to source code and version control systems.
- Use two-factor authentication where required.
- Follow established security policies for development tools and platforms.
What Is an SBOM, and Why Does It Matter?
A Software Bill of Materials (SBOM) is an inventory of the software components included in an application.
For organizations that rely on open-source libraries and third-party frameworks, an SBOM provides greater visibility into what is actually included in the software.
This visibility is important because development teams cannot effectively evaluate third-party risk if they do not know which components they are using.
How Can Developers Manage Third-Party Dependencies?
Dependency security begins with visibility. Teams need to know what software components they are using before they can effectively manage their risk.
Developers should be able to:
- Generate and maintain an SBOM.
- Scan software components for known vulnerabilities.
- Evaluate dependencies before adoption.
- Review licensing obligations.
- Understand organizational supply chain policies.
- Identify potentially risky third-party components.
When Should Teams Review Dependencies?
Dependency security should not be treated as a one-time review.
Developers should evaluate third-party components before introducing them into an application and continue monitoring the software components used throughout development.
Training can help developers understand what to look for when assessing whether a dependency is appropriate for use.
What Are Software Supply Chain Attacks?
The software supply chain includes the systems and components involved in creating, building, and delivering software.
This can include:
- Source code repositories
- Third-party packages
- Package management systems
- Build automation
- CI/CD tools
- Deployment pipelines
Examples of software supply chain threats include:
- Dependency confusion
- Poisoned packages
- Compromised CI/CD tools
- Manipulated dependencies
- Unauthorized changes within build or deployment workflows
Real-world incidents demonstrate how these risks can move rapidly through open-source ecosystems. The Sha1-Hulud npm supply chain attack, for example, highlights the importance of dependency vetting, secrets hygiene, pipeline hardening, and visibility into the components included in an application.
How Can Developers Reduce Software Supply Chain Risk?
Developers can strengthen software supply chain security by applying controls throughout the build and deployment process.
1. Pin Package Versions
Using defined package versions helps teams maintain greater control over the components entering their software.
2. Validate Package Sources
Developers should verify where packages and dependencies originate before introducing them into development environments or applications.
3. Verify Digital Signatures
Signature verification can help teams validate the authenticity and integrity of software components when supported by their development process.
4. Protect CI/CD Pipelines
Build and deployment pipelines should be designed to reduce unauthorized changes and protect the integrity of software releases.
Organizations using Microsoft tooling can apply these principles by integrating security into Azure DevOps, including controls around access, secrets, pipeline security, infrastructure, and monitoring.
5. Maintain Tamper-Resistant Logs
Reliable pipeline and security logging can help teams investigate suspicious activity and determine what occurred during a security incident.
6. Practice Identifying Pipeline Anomalies
Simulated security exercises can expose developers to unusual CI/CD activity in a controlled environment.
How Should Developers Prepare for Security Incidents?
Preventive controls reduce risk, but organizations also need to prepare for situations in which those controls fail.
Developers can play an important role in security incident response because they understand how applications, development tools, dependencies, and deployment systems interact.
Training should prepare developers to:
- Implement secure logging that supports investigation.
- Follow coding practices that can help limit the impact of an attack.
- Recognize suspicious behavior.
- Understand escalation procedures.
- Know when and how to involve security teams.
- Participate effectively in incident response.
Why Are Tabletop and Scenario-Based Exercises Important?
Knowing an incident response process is different from applying it during a security event.
Scenario-based tabletop exercises allow development and security teams to practice how they would respond to realistic incidents without exposing production systems to unnecessary risk.
These exercises can help teams practice:
- Recognizing potential incidents
- Communicating across development and security teams
- Following escalation procedures
- Investigating relevant logs and systems
- Coordinating response activities
Conclusion: Secure More Than Just Your Code
Modern software risk extends beyond what developers write. It includes the dependencies they introduce, the tools they use, the pipelines that build their applications, and the infrastructure that supports deployment.
CMD+CTRL helps teams develop the skills needed to identify and mitigate third-party and software supply chain risks through hands-on training, realistic attack scenarios, and role-based learning paths.
Explore CMD+CTRL’s award-winning training and realistic cyber ranges, or contact us to help your teams secure the entire software ecosystem—from development to deployment.
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