performing-api-fuzzing-with-restler

Fuzz stateful REST APIs with RESTler to uncover security and reliability bugs.

2|Updated Apr 14, 2026

Search Tags:#automation #openapi #api-security #stateful #fuzzing #security-testing #restler

Ready to run

npx skills add https://github.com/Acczdy/MoZiSec --skill performing-api-fuzzing-with-restler

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: performing-api-fuzzing-with-restler
Source: https://github.com/Acczdy/MoZiSec/tree/main/api-security/.claude/skills/performing-api-fuzzing-with-restler
Command: npx skills add https://github.com/Acczdy/MoZiSec --skill performing-api-fuzzing-with-restler

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

Fuzz stateful REST APIs to uncover security and reliability bugs.

Core Features & Use Cases

Stateful fuzzing with OpenAPI-based grammar generation via RESTler to exercise producer-consumer dependencies.
Automated setup: compile API specs, manage authentication, and run test, fuzz-lean, and full fuzz modes.
Results triage: collects run summaries and bug buckets for rapid triage in CI or security playbooks.
Use Case: Security engineers validating a new OpenAPI service in staging to surface 500 errors and token exposure before production.

Quick Start

Run the fuzzing workflow to compile your OpenAPI specification, execute RESTler fuzzing in test and full modes, and review the results.

Frequently Asked Questions about performing-api-fuzzing-with-restler

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

FAQPage Schema

How do I perform stateful API fuzzing using an OpenAPI specification?▼

Stateful API fuzzing using an OpenAPI specification involves compiling the spec into RESTler grammars to exercise producer-consumer dependencies. This uncovers security and reliability bugs by validating multi-step workflows and authentication handling.

Can I integrate API security testing into my CI pipelines for staging services?▼

Yes, you can integrate API security testing into CI pipelines for staging services. The workflow compiles OpenAPI specs, manages authentication, and runs automated fuzzing modes to surface 500 errors and token exposure before production deployment.

What is the best way to fuzz REST APIs to uncover reliability bugs like 500 errors?▼

The best way to fuzz REST APIs for reliability bugs is using stateful automation with RESTler. It compiles API specs, applies custom fuzzing dictionaries, and executes test, fuzz-lean, and full fuzz modes to trigger and capture 500 errors.

Does RESTler support custom fuzzing dictionaries and authentication handling?▼

Yes, RESTler supports custom fuzzing dictionaries and authentication integration. It manages authentication tokens during automated setup to ensure stateful fuzzing can successfully exercise protected multi-step API workflows.

How do I triage API fuzzing results from test and full fuzz modes?▼

To triage API fuzzing results, collect run summaries and bug buckets generated by the test, fuzz-lean, and full fuzz modes. This provides rapid triage capabilities for security playbooks and CI pipeline vulnerability reporting.

When do I need stateful fuzzing instead of standard API testing?▼

You need stateful fuzzing instead of standard API testing when validating OpenAPI-enabled services with complex multi-step workflows. It exercises producer-consumer dependencies to uncover security and reliability bugs that stateless testing cannot detect.