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OWASP Top 10 2025

Understand each risk category in order, then connect it to specific vulnerabilities and defensive decisions.

11 lessons · Approximately 66 minutes · Learn at your pace

Before you start: HTTP and HTTPS Explained, Authentication vs Authorization

  1. OWASP Top 10 OverviewExplore the current web application risk categories and connect them with specific failures and defenses.6 minLesson
  2. A01 · Broken Access ControlCompare an allowed request, an ownership failure and a server-enforced denial in the same application.6 minLesson
  3. A02 · Security MisconfigurationUnderstand security misconfiguration through a fictional failure, a defensive boundary and practical review questions.6 minLesson
  4. A03 · Software Supply Chain FailuresUnderstand software supply chain failures through a fictional failure, a defensive boundary and practical review questions.6 minLesson
  5. A04 · Cryptographic FailuresUnderstand cryptographic failures through a fictional failure, a defensive boundary and practical review questions.6 minLesson
  6. A05 · InjectionUnderstand injection through a fictional failure, a defensive boundary and practical review questions.6 minLesson
  7. A06 · Insecure DesignUnderstand insecure design through a fictional failure, a defensive boundary and practical review questions.6 minLesson
  8. A07 · Authentication FailuresUnderstand authentication failures through a fictional failure, a defensive boundary and practical review questions.6 minLesson
  9. A08 · Software or Data Integrity FailuresUnderstand software or data integrity failures through a fictional failure, a defensive boundary and practical review questions.6 minLesson
  10. A09 · Security Logging and Alerting FailuresUnderstand security logging and alerting failures through a fictional failure, a defensive boundary and practical review questions.6 minLesson
  11. A10 · Mishandling of Exceptional ConditionsUnderstand mishandling of exceptional conditions through a fictional failure, a defensive boundary and practical review questions.6 minLesson

Bring it together

Explain one idea from this path in your own words. Revisit any lesson that still feels uncertain; completion is your choice, not a timer.

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