Pentest List Wiki
  • What is Pentest List Wiki?
  • OFFENSIVE SECURITY
    • External Infrastructure
      • Discovery
        • Email Address Discovery
        • Subdomain Discovery
        • Data Discovery
        • Port & Service Discovery
      • Exploitation
        • Password Spraying
        • Vulnerability Scanning
    • Internal Infrastructure
      • General Discovery
        • AD Attack Path Discovery
        • Port & Service Discovery
      • Credential Discovery
        • Passwords and NetNTLM
        • SAM & LSA secrets
        • NTDS.dit secrets
        • LSASS secrets
        • DCSync
        • DPAPI secrets
      • Movement
        • Credential Spraying
        • SMB Relaying
        • Pass The Hash
      • Infiltration/Exfiltration
        • Pivoting (Proxying)
    • Web Application
      • Discovery
        • Testing API Keys
        • Vulnerability Scan
        • Web Content Discovery
        • Parameter Discovery
        • VHOST Discovery
        • CMS Scanners
      • Exploitation
        • Authentication
          • Email Address Forms
          • AWS Cognito
        • JSON Web Tokens
        • Injection Attacks
          • SQL Injection
          • Cross-Site Scripting
          • HTTP Headers
      • Bypasses
        • Cloudflare Bypass
        • HTTP 403 Bypass
    • Mobile (iOS/Android)
      • iOS
        • IPA Decryption
        • Filesystem Analysis
        • Static Analysis
    • Cloud
      • AWS
        • Vulnerability Scanners
        • S3 Buckets
      • Azure
        • Vulnerability Scanners
        • m365 & Entra ID
  • DEFENSIVE SECURITY
    • Forged Kerberos Tickets
    • Logon Event Visualisation
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On this page
  • JWT Tool
  • Cracking with Hashcat
  1. OFFENSIVE SECURITY
  2. Web Application
  3. Exploitation

JSON Web Tokens

How to exploit JSON Web Tokens.

PreviousAWS CognitoNextInjection Attacks

Last updated 1 year ago

JWT Tool

JWT Tool is great for finding issues in JSON Web Tokens. It will help to identify the following issues:

  • JWT uses HS256 signing algorithm

  • JWT contains sensitive data

  • JWT does not expire

  • JWT permits a NULL signature

  • RS256 to HS256

python jwt_tool.py <JWT> -X a

Cracking with Hashcat

Use the following command to crack JWTs.

hashcat.exe -m 16500 /JWT.txt rockyou.txt --backend-ignore-cuda

JWT.txt should contain your JWT.

Various password wordlists can be used. rockyou.txt is one example.

https://github.com/ticarpi/jwt_tool/
https://hashcat.net/hashcat/