jwt-security-scanner 1.0.0

A tool to scan JWT tokens for security vulnerabilities

JWT Security Scanner 🔐

A Python-based command-line tool that automatically scans JWT tokens for security vulnerabilities and generates professional security reports.

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What is This Tool?

JWT (JSON Web Token) is used by millions of websites to handle user authentication. But poorly configured JWT tokens can be exploited by hackers to bypass login, steal accounts, or gain admin access.

This tool acts like a security doctor for JWT tokens — you give it a token, it runs 5 security checks and tells you exactly what's wrong and how to fix it.

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Features

• Detects 5 critical JWT vulnerability categories
• Beautiful colored terminal output
• Generates professional HTML security report
• Generates text report for documentation
• Includes security recommendations
• Works on any JWT token

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Vulnerabilities Detected

Check	What it detects	Risk Level
Algorithm Check	Dangerous 'none' algorithm usage	CRITICAL
Weak Secret Key	Guesses secret key from common passwords	CRITICAL
Token Expiry	Missing or expired expiry time	HIGH
Sensitive Data	Passwords or private data in payload	HIGH
Token Claims	Missing issuer, subject, audience	MEDIUM

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Tools and Technologies

• Python 3 — Core programming language
• PyJWT — JWT token decoding and validation
• Rich — Beautiful terminal formatting
• Colorama — Terminal color support

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Installation

Step 1 — Clone the repository

git clone https://github.com/YOURUSERNAME/JWT-Security-Scanner.git
cd JWT-Security-Scanner

Step 2 — Install dependencies

pip install -r requirements.txt

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Usage

Run the scanner

python jwt_scanner.py

Or pass token directly

python jwt_scanner.py YOUR_JWT_TOKEN_HERE

Generate a test vulnerable token

python -c "import jwt; print(jwt.encode({'user': 'admin', 'password': 'secret123'}, 'secret', algorithm='HS256'))"

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Example Output

JWT Security Scanner
Finds vulnerabilities in JWT tokens

SECURITY FINDINGS
CRITICAL   WEAK SECRET KEY FOUND: 'secret'
HIGH       No expiry time found!
HIGH       Sensitive fields found: password

SECURITY SUMMARY
CRITICAL   1
HIGH       2
MEDIUM     0
LOW        5

CRITICAL VULNERABILITIES FOUND! This token is DANGEROUS!

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Reports Generated

After every scan the tool automatically generates:

1. Text Report

Plain text file with all findings — perfect for documentation

2. HTML Report

Professional security report with color coded risk levels, summary dashboard, findings table, recommendations and cybersecurity quotes

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What I Learned Building This

• JWT token structure — Header, Payload, Signature
• Common JWT vulnerabilities and how attackers exploit them
• Python security tool development
• Automated vulnerability scanning techniques
• Professional security report generation
• The difference between encoding and encryption

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Real World Application

This tool simulates what penetration testers and security engineers do when auditing web applications. JWT vulnerabilities are listed in the OWASP Top 10 and are responsible for thousands of security breaches every year.

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Project Structure

JWT-Security-Scanner/
│
├── jwt_scanner.py       Main scanner with all checks
├── requirements.txt     Python dependencies
└── README.md           Project documentation

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Also Check Out

My other cybersecurity project:

• AI-Powered SIEM Home Lab — Detects real cyber attacks using Elastic SIEM and Tines automation

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Connect With Me

Built by an aspiring SOC Analyst learning cybersecurity through hands-on projects.

Connect on LinkedIn

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"Security is not a product, but a process." — Bruce Schneier