skills.rest
langbyyi
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API Fuzzing for Bug Bounty

Fuzz REST, SOAP, and GraphQL APIs for vulnerabilities.

96|1|Updated Jun 4, 2026
Search Tags:#penetration testing#bug bounty#idor#graphql security#api fuzzing#api vulnerability#rest api testing
One-click install
npx skills add https://github.com/langbyyi/CyberStrikeAI-SRC --skill api-fuzzing-for-bug-bounty-langbyyi
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: API Fuzzing for Bug Bounty
Source: https://github.com/langbyyi/CyberStrikeAI-SRC/tree/main/skills/api-fuzzing
Command: npx skills add https://github.com/langbyyi/CyberStrikeAI-SRC --skill api-fuzzing-for-bug-bounty-langbyyi

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Manual API security testing during bug bounty and penetration testing engagements often misses critical, API-specific vulnerabilities like IDOR, injection flaws, and authentication bypasses, leading to incomplete assessments and missed reward opportunities.

Core Features & Use Cases

  • Multi-API Type Support: Includes testing workflows for REST, SOAP, and GraphQL APIs, covering endpoint enumeration, authentication testing, and protocol-specific attack vectors.
  • Vulnerability Discovery Techniques: Provides step-by-step guidance for identifying IDOR, SQL/NoSQL injection, XXE, SSRF, rate limit bypasses, and endpoint access control flaws.
  • Use Case: A bug bounty hunter testing a target's e-commerce API can use this skill to systematically enumerate endpoints, test for IDOR in user order endpoints, and check for exposed GraphQL introspection to access sensitive user data.

Quick Start

Use the API Fuzzing for Bug Bounty skill to test the target REST API for IDOR vulnerabilities and undocumented sensitive endpoints.

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 test for IDOR vulnerabilities in a REST API?▼

To test for IDOR vulnerabilities in a REST API, you systematically enumerate endpoints and manipulate object identifiers to bypass broken object level authorization, exposing sensitive user data. This workflow targets endpoint access control flaws during bug bounty engagements.

What is the best way to discover GraphQL security flaws during penetration testing?▼

Discovering GraphQL security flaws during penetration testing involves assessing protocol-specific attack vectors like exposed introspection and query injection. This structured workflow identifies GraphQL endpoint access control flaws and sensitive data exposure in target API deployments.

How do I find injection and SSRF vulnerabilities in SOAP and REST APIs?▼

Finding injection and SSRF vulnerabilities in SOAP and REST APIs requires structured endpoint enumeration and payload fuzzing. This process identifies SQL/NoSQL injection, XXE, and server-side request forgery flaws by systematically testing API inputs and authentication mechanisms.

Can I use API fuzzing to bypass rate limits and access undocumented endpoints?▼

Yes, you can use API fuzzing to bypass rate limits and access undocumented endpoints by systematically testing endpoint access controls. This workflow uncovers hidden sensitive endpoints and rate limit bypasses to maximize bug bounty reward opportunities.

Does API penetration testing cover authentication bypass testing for bug bounties?▼

API penetration testing covers authentication bypass testing for bug bounties by evaluating endpoint access control flaws and broken object level authorization. This structured workflow systematically tests REST, SOAP, and GraphQL authentication mechanisms to expose vulnerabilities.

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