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testing-jwt-token-security

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Assessing JSON Web Token implementations for cryptographic weaknesses, algorithm confusion attacks, and authorization bypass vulnerabilities during security engagements.

skills/testing-jwt-token-security/SKILL.md

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# Testing JWT Token Security

## When to Use

- During authorized penetration tests when the application uses JWT for authentication or authorization
- When assessing API security where JWTs are passed as Bearer tokens or in cookies
- For evaluating SSO implementations that use JWT/JWS/JWE tokens
- When testing OAuth 2.0 or OpenID Connect flows that issue JWTs
- During security audits of microservice architectures using JWT for inter-service authentication

## Prerequisites

- **Authorization**: Written penetration testing agreement for the target
- **jwt_tool**: JWT attack toolkit (`pip install jwt_tool` or `git clone https://github.com/ticarpi/jwt_tool.git`)
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