OWASP, or the Open Web Application Security Project, is a nonprofit foundation dedicated to improving the security of software through open-source projects, documentation, and community-driven research. Founded in 2001, it operates as a vendor-neutral organization, meaning its guidance is not tied to any commercial product or platform. Developers, security engineers, and organizations worldwide rely on OWASP as an authoritative reference for understanding and addressing web application vulnerabilities.
OWASP's most widely recognized contribution is the OWASP Top 10, a regularly updated document that identifies the ten most critical security risks facing web applications. The list is compiled from data gathered across hundreds of organizations and thousands of real-world applications, making it a statistically grounded and broadly applicable resource. Because it distills complex security research into an accessible framework, the OWASP Top 10 has become a standard reference in software development, security audits, and compliance programs.
The categories covered in the Top 10 span a range of attack vectors and design weaknesses. SQL Injection, for instance, has historically appeared near the top of the list, representing cases where malicious input is used to manipulate database queries. Cross-Site Request Forgery (CSRF) is another class of vulnerability the list addresses, where an attacker tricks an authenticated user into unknowingly submitting a harmful request. Broken access control, security misconfigurations, and insecure design are among the other categories that regularly feature in updated editions.
Beyond the Top 10, OWASP maintains a broad library of resources. The OWASP Testing Guide provides detailed methodologies for evaluating application security, while the OWASP Cheat Sheet Series offers concise, developer-friendly guidance on implementing secure coding patterns. Tools such as OWASP ZAP (Zed Attack Proxy) allow developers and security testers to scan applications for vulnerabilities in an automated or manual fashion.
OWASP guidance is also closely related to the deployment of a Web Application Firewall (WAF), a security layer that can be configured to detect and block many of the attack patterns described in the Top 10. While a WAF provides an important line of defense, OWASP consistently emphasizes that security must be built into the development process itself, not added as an afterthought.
For teams building or maintaining web applications, familiarity with OWASP materials is considered a foundational element of responsible development. Many regulatory frameworks and security certifications, including those related to PCI DSS and ISO 27001, reference the OWASP Top 10 as a baseline for application security requirements. Its open and community-maintained nature ensures that the guidance evolves alongside the threat landscape, keeping it relevant as new attack techniques emerge.