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jwt-security

Identify and remediate JWT security vulnerabilities in web applications.

Updated Aug 23, 2026
Search Tags:#security#authentication#vulnerability#jwt#claims#token
One-click install
npx skills add https://github.com/varunisrani/Hare-erp --skill jwt-security
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: jwt-security
Source: https://github.com/varunisrani/Hare-erp/tree/main/indusagi-strix/indusagi-strix-core/skills/technologies/jwt-security
Command: npx skills add https://github.com/varunisrani/Hare-erp --skill jwt-security

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Identify and remediate JWT security vulnerabilities in modern web applications.

Core Features & Use Cases

  • Demonstrates weaknesses in JWT handling including weak/none algorithms, algorithm confusion, token replay, and claim manipulation.
  • Provides guidance on secure signing, short-lived tokens, and robust claim validation across typical service architectures (monoliths and microservices).
  • Use Case: A backend service validates JWTs from an API gateway and rejects tokens with weak signatures, long expirations, or manipulated claims.

Quick Start

Use the jwt-security skill to analyze a sample token and observe vulnerability scenarios, then implement mitigations like RS256/ES256 signing, short expirations, and JTI checks.

Frequently Asked Questions about jwt-security

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

FAQPage Schema
What are common JWT security vulnerabilities in web applications?▼

Common JWT security vulnerabilities include weak or none signing algorithms, algorithm confusion, token replay, claim manipulation, and secret exposure across typical web services.

How do I prevent algorithm confusion attacks with JWT tokens?▼

Prevent algorithm confusion attacks by enforcing secure signing algorithms like RS256 or ES256 and strictly validating all claims and signature types on each request.

How do I validate JWT claims to stop token abuse in microservices?▼

Validate JWT claims to stop token abuse by ensuring short token expirations, enforcing JTI usage for replay prevention, and rejecting manipulated claims across monolithic and microservice architectures.

Does this approach work for securing JWTs across API gateways and backend services?▼

Yes, this approach works for securing JWTs by having backend services validate tokens from an API gateway and rejecting tokens with weak signatures, long expirations, or manipulated claims.

What is the best way to manage JWT secrets and prevent token replay?▼

The best way to manage JWT secrets and prevent token replay is to implement secure secret management practices alongside short-lived tokens and JTI checks for every request.

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