Individual skill
jwt-security-testing
JWT token security testing covering alg:none, algorithm confusion, weak secrets, kid/jwk/jku manipulation, claim tampering, and cross-service acceptance
internal/tools/skills/data/api-security/jwt-security-testing/SKILL.md
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- security Derived category
- testing Derived category
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# JWT Security Testing
## Purpose
Test JWT implementations for signature validation bypasses, claim tampering, algorithm downgrades, and cross-service token acceptance.
## Preconditions
- At least one valid JWT token (operator-supplied, intercepted, or from a login)
- Ability to send requests with the target's auth mechanism (Bearer header, cookie, custom header)
## Attack Surface Signals
- JWT tokens in Authorization headers, cookies, or URL parameters
- `alg` field in decoded header
- Tokens that persist across sessions
- Multiple services sharing the same token issuer