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cwe-347-jwt-signature-bypass

Implement secure JWT signature verification in Java using auth0-java.

3|1|Updated Mar 6, 2026
Search Tags:#security#authentication#jwt#remediation#java#sast#cwe-347
One-click install
npx skills add https://github.com/DevelopersCoffee/java-cwe-security-skills --skill cwe-347-jwt-signature-bypass
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: cwe-347-jwt-signature-bypass
Source: https://github.com/DevelopersCoffee/java-cwe-security-skills/tree/main/cwe-347-jwt-signature-bypass
Command: npx skills add https://github.com/DevelopersCoffee/java-cwe-security-skills --skill cwe-347-jwt-signature-bypass

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill addresses critical security vulnerabilities in Java applications by preventing JWT signature bypass, ensuring the integrity and authenticity of JSON Web Tokens.

Core Features & Use Cases

  • Vulnerability Remediation: Fixes CWE-347 vulnerabilities related to improper JWT signature verification.
  • Secure Token Handling: Implements robust JWT verification, including explicit rejection of the 'none' algorithm.
  • Use Case: When a security audit flags potential JWT signature bypass issues in your Java backend, use this skill to automatically refactor the token verification logic to a secure standard.

Quick Start

Use the cwe-347-jwt-signature-bypass skill to secure the JWT verification logic in the provided Java code snippet.

Frequently Asked Questions about cwe-347-jwt-signature-bypass

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

FAQPage Schema
How do I fix CWE-347 JWT signature bypass vulnerabilities in Java?▼

To fix CWE-347 JWT signature bypass vulnerabilities in Java, refactor token verification logic to enforce strict signature validation and explicitly reject the 'none' algorithm using the auth0-java library.

How does JWT signature bypass happen during authentication?▼

JWT signature bypass happens when token verification logic improperly accepts unsigned tokens or fails to validate algorithm parameters, compromising authentication integrity by allowing forged JSON Web Tokens.

How do I prevent the 'none' algorithm attack in JWT authentication?▼

Prevent the 'none' algorithm attack in JWT authentication by implementing secure token verification that explicitly rejects unsigned tokens and strictly validates expected signature algorithms using the auth0-java library.

Do I need the auth0-java library to remediate JWT signature bypass in Java?▼

Yes, remediating JWT signature bypass in Java requires the auth0-java library to process secure token verification, apply algorithm checks, and maintain token integrity during authentication.

Can I use this remediation for SAST flagged JWT vulnerabilities in Java backends?▼

Yes, use this remediation for SAST flagged JWT vulnerabilities in Java backends to automatically refactor flagged authentication logic into a secure standard that prevents signature bypass.

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