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testing-jwt-token-security

Identify and exploit JWT weaknesses in authorized security assessments.

2|Updated Apr 14, 2026
Search Tags:#jwt#web-security#penetration-testing#security-testing#token-security#jwks#jwt-tool
One-click install
npx skills add https://github.com/Acczdy/MoZiSec --skill testing-jwt-token-security
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: testing-jwt-token-security
Source: https://github.com/Acczdy/MoZiSec/tree/main/web-security/.claude/skills/testing-jwt-token-security
Command: npx skills add https://github.com/Acczdy/MoZiSec --skill testing-jwt-token-security

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires pyjwt, requests, urllib3, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This skill provides a structured methodology and tooling guidance to identify weaknesses in JSON Web Token implementations during authorized security engagements, reducing blind spots in authentication and authorization controls.

Core Features & Use Cases

  • Algorithm testing workflows: Evaluate resilience against algorithm None and algorithm confusion attacks.
  • Key discovery and token analysis: Discover JWKS endpoints, validate token signatures, and analyze claims for misconfigurations.
  • Brute-force and tamper testing: Conduct HMAC secret brute-forcing and claim tampering in controlled environments to verify protection mechanisms.
  • Use case: Assess a web API using JWTs to ensure proper signing, key management, and revocation practices.

Quick Start

Run the JWT security agent against a target service to begin automated JWT testing.

Frequently Asked Questions about testing-jwt-token-security

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

FAQPage Schema
How do I test JWT security for algorithm confusion and none attacks?▼

To test JWT security for algorithm confusion and none attacks, this skill applies structured workflows that evaluate token resilience by tampering with signing algorithms in authorized penetration testing environments to validate defense mechanisms.

What is the best way to brute force JWT HMAC secrets during a security assessment?▼

The best way to brute force JWT HMAC secrets is by using PyJWT and JWT tooling to conduct controlled tampering and secret discovery, validating protection mechanisms and exposing weak signing practices.

Can I use PyJWT to discover and validate JWKS endpoints for token security analysis?▼

Yes, you can use PyJWT alongside requests to discover JWKS endpoints, validate token signatures, and analyze claims for misconfigurations to reduce blind spots in authentication controls.

Does JWT penetration testing require specific authorization and scope boundaries?▼

JWT penetration testing requires clear authorization and scope boundaries to safely execute tests like JKU and KID injections, ensuring that misconfiguration assessments remain within a controlled environment.

How do JKU and KID injections expose JWT misconfigurations in web APIs?▼

JKU and KID injections expose JWT misconfigurations by manipulating key references in web APIs, allowing testers to identify weaknesses in JSON Web Token implementations and verify proper signing practices.

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