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jwt-security

Provides JWT security guidance and validates implementations for ASVS/OWASP compliance.

1|Updated Aug 29, 2025
Search Tags:#security#authentication#jwt#cryptography#best-practices#token#secure-code
One-click install
npx skills add https://github.com/CyberSecAI/genai-sec-agents --skill jwt-security-cybersecai
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: jwt-security
Source: https://github.com/CyberSecAI/genai-sec-agents/tree/main/.claude/skills/jwt-security
Command: npx skills add https://github.com/CyberSecAI/genai-sec-agents --skill jwt-security-cybersecai

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

JWT security guidance, validation rules, and secure coding examples for protecting token-based authentication.

Core Features & Use Cases

  • ASVS-aligned checks: Provides validation guidance for signatures, algorithms, key management, and expiration.
  • Code-ready guidance: Offers secure code snippets across major languages and integration scenarios.
  • Use Case: Security teams auditing API authentication flows can reference patterns and validate library configurations.

Quick Start

Use the jwt-security skill to review your API's JWT handling and implement secure verification by verifying signatures, enforcing allowed algorithms, validating exp/nbf/iat, and implementing proper key management.

Frequently Asked Questions about jwt-security

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

FAQPage Schema
How do I validate JWT signatures and enforce allowed algorithms in my API?▼

To validate JWT signatures securely, enforce strict allowed algorithms, verify signature integrity, and implement proper key management using ASVS-aligned secure code examples. This prevents algorithm confusion attacks during token-based authentication.

What is the best way to implement secure JWT token validation for microservices?▼

Secure JWT token validation for microservices requires verifying signatures, enforcing allowed algorithms, and validating expiration (exp), not-before (nbf), and issued-at (iat) claims using ASVS/OWASP-aligned detection patterns.

Can I use ASVS-guided JWT security checks across different programming languages?▼

Yes, ASVS-guided JWT security checks provide code-ready guidance and secure snippets across major programming languages, supporting diverse API authentication and token-validation workflows.

What JWT security vulnerabilities should I check for when auditing API authentication?▼

When auditing API authentication, check for JWT vulnerabilities including weak signatures, improper algorithm enforcement, poor key management, and missing expiration validation using OWASP-aligned detection patterns.

Why does my JWT validation still fail after checking the signature?▼

JWT validation can fail after signature checks if expiration (exp), not-before (nbf), or issued-at (iat) claims are invalid. ASVS-aligned validation requires verifying all token claims and proper key management.

Do I need to verify exp, nbf, and iat claims for secure token-based authentication?▼

Yes, verifying exp, nbf, and iat claims is essential for secure token-based authentication. ASVS-aligned JWT validation requires checking these timestamps alongside signatures and algorithms to prevent token replay and unauthorized access.

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