PicoCTF Flask Authentication Challenge — Full Writeup

📰 Medium · Cybersecurity

Learn to exploit Flask authentication using sqlite3, John the Ripper, and flask-unsign in the PicoCTF challenge

intermediate Published 10 May 2026
Action Steps
  1. Install the required tools: sqlite3, John the Ripper, and flask-unsign using pip
  2. Run the Flask application and inspect its authentication mechanism using flask-unsign
  3. Extract the hashed password from the SQLite database using sqlite3
  4. Crack the hashed password using John the Ripper
  5. Apply the cracked password to bypass authentication and exploit the Flask application
Who Needs to Know This

Security researchers and penetration testers can benefit from this challenge to improve their web exploitation skills, while developers can learn how to secure their Flask applications

Key Insight

💡 Flask authentication can be exploited using the right tools and techniques, highlighting the importance of secure password storage and authentication mechanisms

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🔓 Exploit Flask authentication using sqlite3, John the Ripper, and flask-unsign in the PicoCTF challenge

Full Article

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