Previous OWASP Risks Course

Editorial Take

The 'Previous OWASP Risks' course fills an important niche by revisiting vulnerabilities that, while merged into broader categories in the OWASP Top Ten 2021, continue to pose real threats in under-secured applications. It serves as a technical deep dive for learners who want to understand the underlying mechanics of attacks that still appear in penetration tests and breach reports.

Standout Strengths

• Historical Context: The course effectively traces how XML External Entities were once standalone risks and why they remain dangerous even when not explicitly listed. This helps learners appreciate the evolution of threat modeling over time.
• Attack Mechanics: Detailed breakdowns of how Cross-Site Scripting payloads execute in browsers clarify the difference between stored, reflected, and DOM-based variants. Visual diagrams enhance comprehension of data flow and injection points.
• Deserialization Deep Dive: Insecure Deserialization is often poorly understood, but this module explains object serialization risks clearly, including how attackers manipulate byte streams to achieve remote code execution.
• Real-World Relevance: Case studies show how XXE flaws have been used to scan internal networks or read sensitive files, proving these aren't just theoretical risks but active attack vectors in modern apps.
• Curriculum Structure: Modules are logically ordered, starting with simpler concepts like XSS and building toward more complex topics like deserialization attacks, supporting gradual skill development.
• Expert Instruction: Infosec delivers content with authority and clarity, avoiding fluff and focusing on actionable knowledge that aligns with industry best practices and secure coding standards.

Honest Limitations

• No Hands-On Labs: The course lacks interactive coding environments or virtual machines where learners can safely practice exploiting or fixing vulnerabilities. This limits skill retention and practical fluency.
• Assumes Prior Knowledge: Learners without foundational web security experience may struggle, as the course doesn't explain basic concepts like HTTP headers or browser rendering, which are essential to grasp the attacks.
• Static Content Delivery: Instruction relies heavily on video lectures and slides, missing opportunities for quizzes, peer review, or dynamic assessments that reinforce learning.
• Outdated Examples: Some demonstrations use older frameworks or libraries, which may not reflect current development stacks, potentially reducing relatability for developers working in modern environments.

How to Get the Most Out of It

• Study cadence: Dedicate 3–4 hours weekly to fully absorb concepts and research supplemental materials. Consistency ensures better retention of technical details across modules.
• Parallel project: Set up a local lab using OWASP WebGoat or DVWA to test each vulnerability type discussed. Applying theory in practice strengthens understanding and builds confidence.
• Note-taking: Document attack patterns, payloads, and mitigation techniques in a personal security wiki. Organizing knowledge improves long-term recall and reference utility.
• Community: Join forums like Reddit’s r/netsec or Discord security groups to discuss findings and get feedback on mitigation strategies from experienced practitioners.
• Practice: Write sample code snippets that intentionally include these flaws, then fix them using recommended secure coding practices to internalize defenses.
• Consistency: Revisit modules after completing hands-on labs to reinforce connections between theory and real-world application, especially for complex topics like deserialization.

Supplementary Resources

• Book: 'The Web Application Hacker’s Handbook' offers deeper technical insight into XXE and XSS, complementing the course with advanced exploitation techniques and case studies.
• Tool: Use Burp Suite Community Edition to intercept and modify requests, testing how XXE and XSS payloads behave in controlled test environments.
• Follow-up: Enroll in the 'OWASP Top Ten' specialization to connect these legacy risks with current security priorities and modern mitigation frameworks.
• Reference: OWASP’s official documentation on XXE, XSS, and Insecure Deserialization provides up-to-date cheat sheets and prevention code samples for ongoing learning.

Common Pitfalls

• Pitfall: Misunderstanding the scope of XXE by focusing only on file reading, while ignoring SSRF-like behaviors and blind XXE exfiltration techniques that are equally dangerous.
• Pitfall: Overlooking context-specific XSS defenses, such as proper escaping in JavaScript versus HTML attributes, leading to incomplete protection in real applications.
• Pitfall: Assuming deserialization is safe if input is validated, without realizing that signature verification or allow-listing classes is also required for true security.

Time & Money ROI

• Time: At 11 weeks with moderate effort, the time investment is reasonable for gaining specialized knowledge that enhances application security expertise.
• Cost-to-value: The paid access model offers decent value for professionals, though free alternatives exist; the structured curriculum justifies the cost for some learners.
• Certificate: The credential adds modest value to a cybersecurity resume, particularly when combined with hands-on projects to demonstrate applied skills.
• Alternative: Free OWASP guides and YouTube tutorials can cover similar content, but this course provides a curated, accredited path ideal for structured learners.

Editorial Verdict

This course succeeds as a concise, technically sound exploration of three enduring web application risks that remain underappreciated despite their consolidation in newer OWASP frameworks. It offers clear, instructor-led explanations that demystify complex attack vectors like XXE and Insecure Deserialization, making it a solid choice for intermediate learners aiming to strengthen their security analysis capabilities. While not comprehensive enough to stand alone, it fills a valuable gap for those seeking to understand how historical vulnerabilities continue to influence modern threat landscapes.

However, the lack of interactive components and reliance on passive learning formats reduce its effectiveness for hands-on developers. The price point may deter budget-conscious learners, especially given the availability of free resources covering similar topics. Still, when paired with external labs and community engagement, this course becomes a worthwhile component of a broader security education plan. We recommend it with reservations—ideal for self-motivated learners who supplement the content, but less suited for beginners or those expecting immersive experiences.