Free CSSLP Practice Test 2026 — ISC² Certified Secure Software Lifecycle Professional

Last updated: May 2026 · Aligned with the current ISC² CSSLP CBK · 500+ questions across all 8 domains

This free CSSLP practice test covers all 8 official ISC² CSSLP Common Body of Knowledge (CBK) domains. Each question includes a detailed explanation grounded in real-world secure SDLC, threat modeling, and AppSec scenarios — perfect for CSSLP exam prep.

CSSLP vs CISSP — Which ISC² Cert Is Right for You?

Many security professionals weigh CSSLP against CISSP. CISSP is the broad, management-level information-security certification; CSSLP is the focused, builder-level certification for engineers and architects who write, review, or secure software. Use the table below to decide which fits your role.

AttributeCSSLPCISSP
FocusSecure software development lifecycleBroad information security management
Target audienceDevelopers, AppSec engineers, architects, DevSecOpsSecurity managers, CISOs, generalists
Domains8 CBK (SDLC-focused)8 CBK (enterprise security)
Questions125 multiple choice100–150 adaptive (CAT)
Duration4 hours3 hours
Pass score700 / 1000700 / 1000
Experience4 years SDLC (or 3 + degree)5 years across 2+ CISSP domains
Cost$599$749
Best forBuilding / reviewing secure codeLeading a security program

If your day job involves writing code, designing architectures, threat modeling, or running AppSec tooling (SAST/DAST/SCA), CSSLP maps directly to your work. CISSP is the better choice if you manage policy, governance, or a broad security team.

Recommended 8-Week CSSLP Study Plan

  1. Week 1 — Secure Software Concepts (10%): Anchor on CIA, least privilege, defense in depth, threat modeling fundamentals.
  2. Week 2 — Secure Software Lifecycle Management (11%): SDLC integration, BSIMM/SAMM, DevSecOps, security metrics.
  3. Week 3 — Secure Software Requirements (14%): Abuse/misuse cases, GDPR/HIPAA/PCI, data classification.
  4. Week 4 — Secure Software Architecture & Design (14%): STRIDE, PASTA, zero trust, secure design patterns.
  5. Week 5 — Secure Software Implementation (14%): OWASP Top 10, input validation, output encoding, crypto correctness.
  6. Week 6 — Secure Software Testing (14%): SAST, DAST, IAST, SCA, fuzzing, pen testing.
  7. Week 7 — Secure Software Deployment, Operations & Maintenance (12%): Secrets management, logging, IR, patching, EOL.
  8. Week 8 — Secure Software Supply Chain (11%): SBOM, OSS risk, vendor assessment, code signing, build pipeline integrity.

Spend the last week running full-length mock exams and re-attempting any domain where you score under 75%.

Practice the 8 CSSLP CBK Domains

16 Free Sample CSSLP Questions with Answers

Each question below includes 4 answer options, the correct answer, and a detailed explanation. These are real questions from the FlashGenius CSSLP question bank — two from each of the 8 CBK domains.

Sample Question 1 — Secure Software Architecture and Design

A financial services company is developing a new web application that handles sensitive customer data. During the design phase, the security team is tasked with integrating security measures into the architecture. Which of the following approaches should they prioritize to ensure the application is resilient against common web vulnerabilities?

  1. A. Implementing a Web Application Firewall (WAF) to filter and monitor HTTP traffic.
  2. B. Conducting a threat modeling session to identify potential attack vectors and design mitigations. (Correct answer)
  3. C. Ensuring compliance with the company's existing password policy.
  4. D. Utilizing a container orchestration platform to manage application deployment.

Correct answer: B

Explanation: Conducting a threat modeling session during the design phase helps identify potential attack vectors and allows the team to design appropriate mitigations, making the application more resilient against common web vulnerabilities. While other options are beneficial, threat modeling directly addresses security in the architecture phase.

Sample Question 2 — Secure Software Architecture and Design

A software development team is adopting DevSecOps practices to improve the security posture of their CI/CD pipeline. Which activity should be integrated into the pipeline to detect vulnerabilities in open-source components used by the application?

  1. A. Performing static code analysis on the proprietary codebase.
  2. B. Implementing dynamic application security testing (DAST) during the testing phase.
  3. C. Utilizing a software composition analysis (SCA) tool to scan for known vulnerabilities in dependencies. (Correct answer)
  4. D. Conducting regular security awareness training for developers.

Correct answer: C

Explanation: Utilizing a software composition analysis (SCA) tool is essential in a DevSecOps pipeline to automatically scan open-source components for known vulnerabilities. This ensures that dependencies are secure and up-to-date, addressing supply chain risks.

Sample Question 3 — Secure Software Concepts

A financial services company is adopting a DevSecOps approach to improve their software development lifecycle. They have legacy systems that must integrate with newer microservices-based applications. Which of the following should be prioritized to ensure security across the entire system?

  1. A. Implementing automated security testing in the CI/CD pipeline. (Correct answer)
  2. B. Conducting annual penetration testing on the legacy systems.
  3. C. Deploying a separate firewall for the microservices.
  4. D. Rewriting the legacy systems using modern programming languages.

Correct answer: A

Explanation: Integrating automated security testing into the CI/CD pipeline ensures continuous security assessment and rapid feedback, which is crucial in a DevSecOps environment. This approach helps identify vulnerabilities early in both legacy and new systems, ensuring a consistent security posture.

Sample Question 4 — Secure Software Concepts

During a threat modeling session for a new web application, the development team identifies a potential threat where an attacker could intercept and modify data sent between the client and server. Which security control would most effectively mitigate this threat?

  1. A. Implementing input validation on the server side.
  2. B. Enforcing the use of HTTPS for all communications. (Correct answer)
  3. C. Using a Web Application Firewall (WAF).
  4. D. Conducting regular security audits.

Correct answer: B

Explanation: Enforcing HTTPS ensures that data transmitted between the client and server is encrypted, preventing interception and modification by attackers. This is a fundamental control for protecting data in transit.

Sample Question 5 — Secure Software Deployment, Operations, Maintenance

A financial services company is deploying a new application in a cloud environment. The company has a strong DevSecOps culture and wants to ensure that security is integrated into their CI/CD pipeline. Which of the following practices would best help the company identify vulnerabilities early in the deployment process?

  1. A. Implementing a static application security testing (SAST) tool in the build phase. (Correct answer)
  2. B. Conducting manual penetration testing after deployment.
  3. C. Relying on network firewalls to protect the application.
  4. D. Performing regular vulnerability scans in the production environment.

Correct answer: A

Explanation: Implementing a static application security testing (SAST) tool in the build phase allows developers to identify and fix vulnerabilities early in the software development lifecycle, aligning with DevSecOps practices.

Sample Question 6 — Secure Software Deployment, Operations, Maintenance

An organization is using a third-party open-source library in its application. To manage risks associated with supply chain security, what is the most effective approach the organization should take?

  1. A. Periodically check for updates to the library and apply them immediately.
  2. B. Conduct a comprehensive security assessment of the library before integration.
  3. C. Rely solely on the library's documentation for security information.
  4. D. Implement a Software Bill of Materials (SBOM) to track the library and its dependencies. (Correct answer)

Correct answer: D

Explanation: Implementing a Software Bill of Materials (SBOM) allows the organization to track all components and dependencies, facilitating better risk management and quick response to vulnerabilities.

Sample Question 7 — Secure Software Implementation

A financial services company is transitioning its software development processes to incorporate DevSecOps practices. The team is evaluating their CI/CD pipeline to ensure it aligns with secure software implementation practices. Which of the following actions should be prioritized to enhance security in their CI/CD pipeline?

  1. A. Implementing automated code reviews to detect vulnerabilities before deployment. (Correct answer)
  2. B. Increasing the frequency of software releases to quickly address security patches.
  3. C. Using proprietary encryption algorithms to protect data in transit.
  4. D. Allowing developers to push code directly to production environments to speed up the release cycle.

Correct answer: A

Explanation: Automated code reviews are essential in a DevSecOps environment to identify and mitigate vulnerabilities early in the development process. This practice helps maintain security without slowing down the development cycle, unlike options B and D, which might introduce risks. Option C is not recommended as proprietary encryption algorithms can be less secure than well-vetted, standard algorithms.

Sample Question 8 — Secure Software Implementation

During a threat modeling session for a new web application, the security team identifies a potential risk related to third-party libraries. What is the most appropriate action to mitigate this risk within the secure software implementation process?

  1. A. Remove all third-party libraries and rewrite the functionality in-house.
  2. B. Conduct regular vulnerability assessments and maintain an up-to-date Software Bill of Materials (SBOM). (Correct answer)
  3. C. Only use third-party libraries that are open source to ensure transparency.
  4. D. Rely on the library's community to report and fix vulnerabilities.

Correct answer: B

Explanation: Regular vulnerability assessments and maintaining an SBOM are critical for managing risks associated with third-party libraries. This approach ensures that vulnerabilities are identified and addressed promptly. Option A is impractical and costly, while options C and D do not provide sufficient assurance of security.

Sample Question 9 — Secure Software Lifecycle Management

Your company is integrating security practices into its existing CI/CD pipeline. The development team uses a mix of open-source and proprietary components. Which of the following practices should be prioritized to manage security risks effectively?

  1. A. Implement static application security testing (SAST) during the build phase. (Correct answer)
  2. B. Conduct a manual code review after each release.
  3. C. Perform penetration testing only on major releases.
  4. D. Rely on third-party vendors to secure open-source components.

Correct answer: A

Explanation: Implementing static application security testing (SAST) during the build phase helps identify security vulnerabilities early in the software development lifecycle. This practice is particularly important when using a mix of open-source and proprietary components, as it allows for continuous security assessment and remediation.

Sample Question 10 — Secure Software Lifecycle Management

A financial institution is developing a new web application that must comply with industry regulations for data protection. During the threat modeling process, which of the following should be the primary focus?

  1. A. Identifying potential threats and vulnerabilities in the application's third-party libraries. (Correct answer)
  2. B. Ensuring the application meets performance benchmarks.
  3. C. Minimizing the application's development cost.
  4. D. Maximizing user interface aesthetics.

Correct answer: A

Explanation: In a regulated environment, such as a financial institution, identifying potential threats and vulnerabilities in third-party libraries is crucial. This focus helps ensure compliance with data protection regulations and mitigates risks associated with the use of third-party components.

Sample Question 11 — Secure Software Requirements

An organization is developing a new cloud-based application and wants to ensure that security requirements are integrated early in the software development lifecycle (SDLC). What is the most effective approach to achieve this?

  1. A. Conduct a security review after the application has been deployed to the cloud.
  2. B. Incorporate security requirements during the requirements gathering phase. (Correct answer)
  3. C. Perform penetration testing during the final stages of development.
  4. D. Rely on cloud provider security features to protect the application.

Correct answer: B

Explanation: Incorporating security requirements during the requirements gathering phase ensures that security is considered from the outset of the project. This proactive approach helps identify potential security issues early and integrate appropriate controls throughout the SDLC.

Sample Question 12 — Secure Software Requirements

A financial services company is implementing a DevSecOps approach to improve the security of its software development process. Which practice best exemplifies the integration of security into the CI/CD pipeline?

  1. A. Running automated security tests as part of the build process. (Correct answer)
  2. B. Conducting annual security awareness training for developers.
  3. C. Performing manual code reviews after each release.
  4. D. Outsourcing security testing to a third-party vendor.

Correct answer: A

Explanation: Running automated security tests as part of the build process is a core practice of DevSecOps. It ensures that security checks are performed continuously and integrated into the CI/CD pipeline, allowing for early detection and remediation of vulnerabilities.

Sample Question 13 — Secure Software Supply Chain

As a software development manager for a healthcare application, you need to ensure that all third-party components used in the application comply with industry security standards. The application is deployed in a CI/CD pipeline and uses open-source libraries extensively. Which approach would best help you manage the security risks associated with these third-party components?

  1. A. Regularly update all components to their latest versions without conducting any further analysis.
  2. B. Implement a Software Bill of Materials (SBOM) to track and manage all third-party components and their versions. (Correct answer)
  3. C. Rely on the open-source community to identify and patch vulnerabilities in the components.
  4. D. Limit the use of third-party components to only those that are part of the NIST SP 800-53 framework.

Correct answer: B

Explanation: Implementing a Software Bill of Materials (SBOM) allows you to have a detailed inventory of all third-party components, which is crucial for tracking and managing the security risks associated with them. This approach aligns with secure software supply chain practices and helps ensure compliance with industry standards.

Sample Question 14 — Secure Software Supply Chain

Your organization is transitioning to a DevSecOps model to enhance the security of its software supply chain. As part of this transition, which practice should be prioritized to ensure that security is integrated throughout the software development lifecycle?

  1. A. Conducting annual security audits to identify vulnerabilities.
  2. B. Incorporating automated security testing into the continuous integration process. (Correct answer)
  3. C. Requiring developers to attend a one-time security training session.
  4. D. Outsourcing security assessments to an external vendor.

Correct answer: B

Explanation: Incorporating automated security testing into the continuous integration process ensures that security checks are consistently applied throughout the development lifecycle. This practice is central to the DevSecOps model and helps identify vulnerabilities early, reducing the risk of security issues in production.

Sample Question 15 — Secure Software Testing

A financial services company is integrating security testing into its CI/CD pipeline. The development team is using a mix of open-source and proprietary libraries. Which approach should the team prioritize to ensure the security of third-party components?

  1. A. Implement static application security testing (SAST) on proprietary code only.
  2. B. Use a software composition analysis (SCA) tool to identify vulnerabilities in third-party components. (Correct answer)
  3. C. Rely on manual code reviews for all third-party libraries.
  4. D. Perform dynamic application security testing (DAST) on the integrated application.

Correct answer: B

Explanation: Using a software composition analysis (SCA) tool is essential for identifying known vulnerabilities in third-party components, which is crucial when integrating open-source and proprietary libraries.

Sample Question 16 — Secure Software Testing

During a threat modeling session for a new web application, the team identifies a potential threat of SQL injection. What is the most effective way to verify that the application is secure against this threat?

  1. A. Conduct a code review focusing on SQL query construction. (Correct answer)
  2. B. Implement input validation and output encoding.
  3. C. Run a penetration test to specifically check for SQL injection vulnerabilities.
  4. D. Ensure all database queries use parameterized statements.

Correct answer: A

Explanation: In secure software development, it is critical to distinguish between mitigating a threat and verifying that defense. While using parameterized statements (Option D) is the right way to prevent SQL injection, conducting a comprehensive code review is the most effective way to actually verify that the developers implemented those secure practices correctly across the entire application.

Quick Start CSSLP Mock Exam

Take a free 10-question CSSLP quick-start practice test covering all 8 CBK domains. Get instant scoring with detailed explanations — perfect for a quick readiness check.

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