Individual skill
testing-for-json-web-token-vulnerabilities
Tests JWT implementations for algorithm confusion, "none" algorithm bypass, kid/jku parameter injection, and weak secret exploitation using jwt_tool and Burp Suite's JWT Editor extension, aiming to achieve authentication bypass and privilege escalation. Use when assessing JWT-based auth/session management, OAuth2/OIDC token handling, or SSO systems during a security engagement.
skills/testing-for-json-web-token-vulnerabilities/SKILL.md
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- Last checked
- Nov 9, 2026
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- Repository last updated
- Aug 31, 2026
- License
- Apache-2.0
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- ai-agents Repository topic
- claude-code Repository topic
- cybersecurity Repository topic
- incident-response Repository topic
- mitre-attack Repository topic
- penetration-testing Repository topic
- red-team Repository topic
- security Repository topic
- cloud-security Repository topic
- malware-analysis Repository topic
- jwt Declared skill tag
- json-web-token Declared skill tag
- algorithm-confusion Declared skill tag
- authentication-bypass Declared skill tag
- token-forgery Declared skill tag
- kid-injection Declared skill tag
- jku-attack Declared skill tag
- security Derived category
- testing Derived category
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Read excerpt
# Testing for JSON Web Token Vulnerabilities
## When to Use
- When testing applications using JWT for authentication and session management
- During API security assessments where JWTs are used for authorization
- When evaluating OAuth 2.0 or OpenID Connect implementations using JWT
- During penetration testing of single sign-on (SSO) systems
- When auditing JWT library configurations for known vulnerabilities
## Prerequisites
- jwt_tool (Python JWT exploitation toolkit)
- Burp Suite with JWT Editor extension
- jwt.io for decoding and inspecting JWT structure
- Understanding of JWT structure (header.payload.signature) and algorithms (HS256, RS256)