testing-for-json-web-token-vulnerabilities - Test JSON Web Tokens for security vulnerabilities.
Test JWT implementations for critical vulnerabilities including algorithm confusion, none algorithm bypass, kid injection, and weak secrets.
Tags
Updated: 2026-09-20Capabilities
Typical Inputs
Typical Outputs
What this skill does
- Decode and analyze JWT structure
- Test none algorithm bypass
- Test algorithm confusion
- Test key ID parameter injection
- Test JKU and X5U header injection
- Brute-force weak JWT secrets
Inputs
- JWT token
- Target application URL
- Public key or SSL certificate
- Wordlist file
Outputs
- JWT security assessment report
- Forged JWT token
- Discovered secret key
Requirements
- Python environment with PyJWT
- jwt_tool toolkit
- Burp Suite with JWT Editor extension
- hashcat or John the Ripper tool
- Authorized access to target application