skills.rest
zebbern
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API Fuzzing for Bug Bounty

Guide automated fuzz testing across REST, SOAP, and GraphQL APIs.

4.5k|458|Updated Jun 21, 2025
Search Tags:#GraphQL#REST#IDOR#pentesting#fuzzing#bug-bounty#API-security
One-click install
npx skills add https://github.com/zebbern/claude-code-guide --skill api-fuzzing-for-bug-bounty
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: API Fuzzing for Bug Bounty
Source: https://github.com/zebbern/claude-code-guide/tree/main/skills/api-fuzzing-bug-bounty
Command: npx skills add https://github.com/zebbern/claude-code-guide --skill api-fuzzing-for-bug-bounty

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill helps security researchers and developers identify API security weaknesses by guiding structured fuzz testing across REST, SOAP, and GraphQL endpoints, reducing blind spots and accelerating vulnerability discovery.

Core Features & Use Cases

  • API Reconnaissance and endpoint discovery across versioned APIs (e.g., /v1, /v2, /v3).
  • Fuzzing with customizable wordlists and payload strategies to reveal misconfigurations, weak auth, and data exposure.
  • Vulnerability coverage including IDOR, authentication bypass, SQLi, SSRF, XXE, and improper input validation for REST, GraphQL, and SOAP APIs.
  • Security assessment workflow support for bug bounty engagements, continuous hardening, and pre-release security testing.

Quick Start

Configure the fuzzer with your target API URL, wordlists, and endpoint scope, then run the workflow with the provided scripts. Example: python3 fuzz_api.py --target https://api.example.com --wordlist /path/to/wordlist.txt --endpoints /v1,/v2,/v3 --auth-token "YOUR_TOKEN" --output findings.json

Frequently Asked Questions about API Fuzzing for Bug Bounty

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I fuzz a GraphQL API for vulnerabilities like IDOR?▼

Fuzzing a GraphQL API for IDOR involves guiding automated payload testing across endpoints to reveal weak authorization and data exposure. This skill structures fuzz testing workflows to uncover IDOR, authentication bypass, and input validation flaws efficiently.

What is the best way to automate REST API fuzzing across multiple versions?▼

Automating REST API fuzzing across versions requires configuring a fuzzer with target URLs and endpoint scopes like /v1, /v2, and /v3. This skill guides automated testing across versioned APIs to reveal misconfigurations, weak auth, and data exposure.

Do I need Burp Suite and Python scripting to perform API pentesting?▼

Yes, executing API pentesting with this skill requires Burp Suite or a similar proxy, alongside Python scripting. You also need API wordlists and knowledge of REST, GraphQL, and SOAP protocols to run tests and generate findings.

Can I test authenticated API endpoints during a bug bounty engagement?▼

Yes, you can test authenticated API endpoints during bug bounty engagements. This skill supports security assessment workflows for both authenticated and unauthenticated access, allowing you to pass authorization tokens when fuzzing targeted endpoints.

What vulnerabilities can I discover through SOAP and REST API fuzzing?▼

SOAP and REST API fuzzing can discover vulnerabilities including IDOR, authentication bypass, SQLi, SSRF, XXE, and improper input validation. This skill targets these specific security weaknesses to reduce blind spots in API assessments.

How do I generate findings output after running an API fuzzing script?▼

Generating findings output after API fuzzing involves running the configured Python script with an output flag. This skill executes tests and automatically generates a JSON file containing the discovered API vulnerabilities and assessment results.

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