Does this skill require external tools?

The skill uses Claude's built-in tools like Bash and Edit to generate scripts and execute requests, but it can be integrated with other security analysis tools for deeper assessments.

Can I use this skill on live production APIs?

It is highly recommended to use this skill only in staging or development environments, as fuzzing can cause unexpected crashes, service downtime, or data corruption.

Which vulnerabilities can the API Fuzzer detect?

The skill is designed to target SQL injection, Cross-Site Scripting (XSS), command injection, and general input validation failures.

Fuzzing is a testing technique that involves sending invalid, unexpected, or random data to an API to identify security vulnerabilities, crashes, and stability issues.

How do I trigger the fuzzing process?

You can initiate a scan by using the `/fuzz-api` command followed by specific instructions regarding the endpoint or parameters you wish to test.

API Security Fuzzer

Name: API Security Fuzzer
Author: jeremylongshore

byjeremylongshore

•

883

Security & Testing

Automates security fuzz testing for REST APIs to identify vulnerabilities like SQL injection, XSS, and input validation failures.

About

The API Security Fuzzer skill empowers Claude to perform rigorous security assessments on RESTful services by generating and injecting malformed data, boundary values, and random payloads. It streamlines the identification of critical vulnerabilities—including SQL injection, cross-site scripting (XSS), and command injection—by analyzing API responses for unexpected behavior or crashes. This tool is essential for developers and security engineers looking to harden their API infrastructure against edge cases and malicious exploits during the development lifecycle.

Key Features

Automated payload generation for SQLi, XSS, and command injection
Real-time response analysis to detect crashes and validation errors
Seamless integration into CI/CD security workflows
883 GitHub stars
Boundary value and edge case testing for API parameters
Support for targeted fuzzing of specific endpoints and parameters

Use Cases

Verifying the effectiveness of server-side input validation logic
Stress-testing API robustness against malformed or extremely large payloads
Identifying hidden SQL injection vulnerabilities in user-facing endpoints

About

Key Features

Automated payload generation for SQLi, XSS, and command injection
Real-time response analysis to detect crashes and validation errors
Seamless integration into CI/CD security workflows
883 GitHub stars
Boundary value and edge case testing for API parameters
Support for targeted fuzzing of specific endpoints and parameters

Use Cases

Verifying the effectiveness of server-side input validation logic
Stress-testing API robustness against malformed or extremely large payloads
Identifying hidden SQL injection vulnerabilities in user-facing endpoints