OWASP Top 10 Definition The OWASP Top 10 is a high-level awareness document that summarizes the most important web application security risk categories. It is not a complete methodology, but it is one of the best starting maps for what repeatedly goes wrong in real applications. Why it matters This note matters because it helps organize the web-security branch around root causes instead of random exploits. It gives you a vocabulary for common risk categories and a shared frame for discussing priorities, testing, and mitigation. Attacker perspective Attackers do not care about the Top 10 as a checklist. They care about the underlying classes of weakness it names: - broken access control - injection - insecure design - identification and authentication failures - security misconfiguration The value of this note is not memorization. It is learning where entire families of exploitable mistakes come from. Defender perspective Defenders should use the Top 10 as: - a prioritization aid - a communication tool with developers - a bridge into deeper standards like WSTG and ASVS It is useful for orientation, but not enough by itself to test or secure an application. Practical examples A team says “we don’t have SQL injection,” but still has broken access control and insecure design. A review names “XSS” as the problem, but the root cause is broader input/output handling and missing security controls. A roadmap uses Top 10 categories to decide which labs and playbooks to build first. Related notes broken-access-control auth-flaws sql-injection xss ssrf References Foundational: OWASP Top Ten Web Application Security Risks — https://owasp.org/www-project-top-ten/ Foundational: OWASP Top 10 2021 Introduction — https://owasp.org/Top10/2021/A00_2021_Introduction/ Foundational: OWASP Top 10 related cheat sheets — https://cheatsheetseries.owasp.org/IndexTopTen.html ← PreviousOpen RedirectNext →Path Traversal Explore nearby notes Web SecurityAuthentication FlawsAuthentication flaws are weaknesses in how an application verifies identity. They include weak login logic, user enumeration, broken MFA flows, password reset... Web SecurityBot Detection SignalsBot detection signals are the observable clues a web application or edge service uses to classify traffic as human, benign automation, suspicious automation, or... Web SecurityBroken Access ControlBroken access control happens when an application fails to enforce what a caller is allowed to access or do. Web SecurityBusiness Logic VulnerabilitiesBusiness logic vulnerabilities are flaws in the intended workflow, assumptions, invariants, or rule design of an application, where the system behaves as coded but... Web SecurityClickjackingClickjacking is a UI redress attack where an attacker embeds a target page in a frame and tricks the user into clicking or typing into the real target UI while... Web SecurityCommand InjectionCommand injection occurs when an application builds an operating-system command from attacker-controlled input and executes it through a shell or process API...