OWASP, the Open Worldwide Application Security Project (formerly the Open Web Application Security Project), is a nonprofit foundation dedicated to improving the security of software. It is a globally recognized, community-driven organization that produces freely available resources – including tools, documentation, standards, methodologies, and educational materials – to help developers, security professionals, and organizations build and maintain more secure applications. Because its materials are open, vendor-neutral, and created by a broad community of security experts, OWASP has become one of the most influential and trusted authorities in application security.
OWASP is best known for its “Top 10” lists, which enumerate the most critical security risks in a given domain and serve as widely referenced awareness and prioritization guides. The OWASP Top 10 for web application security is perhaps the most famous, cataloging the most prevalent and serious web application vulnerabilities. Recognizing that APIs face distinct threats, OWASP also produces the OWASP API Security Top 10, focused specifically on the most critical API vulnerabilities – such as Broken Object Level Authorization, Broken Authentication, and Broken Function Level Authorization. These lists are periodically updated to reflect the evolving threat landscape and are treated across the industry as foundational references.
Beyond the Top 10 lists, OWASP maintains a wide range of projects and resources: security testing guides, the Application Security Verification Standard (ASVS), cheat sheets offering practical guidance on specific topics, threat-modeling resources, and numerous open-source security tools. It also fosters a global community through local chapters, conferences, and collaborative projects, spreading security knowledge and best practices worldwide.
OWASP’s significance in the API and application security context is substantial. Its frameworks give organizations a common vocabulary and a prioritized understanding of the most important risks, guiding secure development, testing, and defense. Many security programs, tools, and compliance efforts explicitly align with OWASP guidance. For APIs specifically, the OWASP API Security Top 10 has become the reference point for understanding and addressing the unique risks that APIs present – distinct from traditional web application risks. In essence, OWASP provides the open, authoritative knowledge base that helps the industry understand what the most important security risks are and how to address them, making it a cornerstone of modern application and API security practice.