OWASP Top 10 Security Vulnerabilities

Learn about the most critical web application security risks with examples and prevention methods

What is OWASP Top 10?

The OWASP Top 10 is a standard awareness document for developers and web application security. It represents a broad consensus about the most critical security risks to web applications.

Note: This tool is for educational purposes only. Always ensure you have proper authorization before testing security vulnerabilities.

A01: Broken Access Control

Critical

Restrictions on what authenticated users are allowed to do are not properly enforced.

94% of applications tested

A02: Cryptographic Failures

Critical

Failures related to cryptography which often lead to sensitive data exposure.

Previously "Sensitive Data Exposure"

A03: Injection

Critical

SQL, NoSQL, OS, and LDAP injection flaws occur when untrusted data is sent to an interpreter.

SQL, NoSQL, OS, LDAP

A04: Insecure Design

High

Risks related to design and architectural flaws, with a focus on secure design patterns.

New in 2021

A05: Security Misconfiguration

High

Security misconfiguration is the most commonly seen issue, often due to insecure default configurations.

90% of applications

A06: Vulnerable Components

High

Using components with known vulnerabilities, including libraries, frameworks, and other software modules.

Previously "Using Components"

A07: Authentication Failures

High

Confirmation of the user's identity, authentication, and session management is critical.

Previously "Broken Authentication"

A08: Software and Data Integrity Failures

Medium

Software and data integrity failures relate to code and infrastructure that does not protect against integrity violations.

New in 2021

A09: Security Logging Failures

Medium

Insufficient logging and monitoring, coupled with ineffective or non-existent incident response.

Previously "Insufficient Logging"

A10: Server-Side Request Forgery

Medium

SSRF flaws occur whenever a web application is fetching a remote resource without validating the user-supplied URL.

New in 2021

General Prevention Guidelines

Input Validation

Validate and sanitize all user inputs

Authentication

Implement strong authentication mechanisms

Authorization

Enforce proper access controls

Encryption

Encrypt sensitive data in transit and at rest

Logging

Implement comprehensive logging and monitoring

Updates

Keep all components updated