OWASP Top 10 Explained for Beginners

The OWASP Top 10 is the most widely recognized list of critical web application security risks. Understanding these vulnerabilities is essential for every developer and security professional.

A01: Broken Access Control

Access control enforces policies so that users cannot act outside their intended permissions. Failures can lead to unauthorized information disclosure, modification, or destruction of data.

**Prevention:** Implement proper role-based access control, deny by default, and validate permissions on every request.

A02: Cryptographic Failures

Previously known as "Sensitive Data Exposure," this category focuses on failures related to cryptography that often lead to exposure of sensitive data.

**Prevention:** Encrypt data in transit and at rest, use strong algorithms, and never store passwords in plaintext.

A03: Injection

Injection flaws occur when untrusted data is sent to an interpreter as part of a command or query. SQL injection, NoSQL injection, and command injection are common examples.

**Prevention:** Use parameterized queries, input validation, and ORM frameworks.

A04–A10

The remaining categories cover security misconfiguration, vulnerable components, authentication failures, software integrity failures, logging failures, and server-side request forgery (SSRF). Each represents a critical area that developers must address.

Next Steps

Study each category in depth, practice on platforms like DVWA and WebGoat, and apply these principles in your own projects. Security is everyone's responsibility.