JWT Security Testing

JWT Fuzzer

Test JWT security with fuzzing techniques. Generate modified JWT tokens for security testing and vulnerability assessment. Perfect for penetration testing and security audits.

Security Notice: This tool is for authorized security testing only. Only use on applications you own or have explicit permission to test.

JWT Token Input

Enter the JWT token you want to fuzz for security testing

JWT Token

Fuzzing Techniques

None Algorithm Attack

Remove signature by setting algorithm to 'none'

HIGH

Weak Secret Attack

Try common weak secrets like 'secret', 'password', etc.

MEDIUM

Key ID Injection

Modify 'kid' header to point to malicious key

HIGH

JWK Set URL Injection

Inject malicious JWK Set URL in 'jku' header

HIGH

Expiration Manipulation

Modify or remove expiration claims

MEDIUM

Issuer Manipulation

Modify issuer claim to bypass validation

MEDIUM

Audience Manipulation

Modify audience claim to access different resources

HIGH

Role Escalation

Modify role/permission claims to gain higher privileges

CRITICAL

About JWT Fuzzing

What is JWT Fuzzing?

JWT fuzzing is a security testing technique that involves modifying JWT tokens to identify vulnerabilities in token validation and processing.

Common Vulnerabilities

• Algorithm confusion attacks
• Weak secret keys
• Key injection vulnerabilities
• Token replay attacks
• Privilege escalation

How to Use

1. Enter a valid JWT token
2. Select fuzzing techniques
3. Click "Start Fuzzing"
4. Review generated test cases
5. Test against your application