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How To Discover Hidden Endpoints🕵️‍♂️

Abhijeet Kumawat
InfoSec Write-ups
Published in
3 min readMar 17, 2025

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🔍 Hidden endpoints often contain sensitive functionalities, unreleased features, or admin-only actions. Finding these endpoints can lead to IDORs, privilege escalations, and critical business logic flaws. Let’s explore advanced techniques to uncover them! 🛡️✨

Created by copilot

1. Passive Discovery with JavaScript Analysis 📚🕵️‍♂️

🛠️ Tool: LinkFinder ⚙️

🧪 Method: Extract URLs from JavaScript files using regex-based scanning.

💻 Example Command:

python3 linkfinder.py -i https://target.com/script.js -o cli

💡 Tip: Look for endpoints like /admin, /debug, /beta, or unusual API routes.

🔑 What to do after discovery?

  • 🖱️ Manually visit each endpoint.
  • 🔓 Test for authentication bypass by removing tokens.
  • 🛡️ Attempt common parameters such as ?admin=true or ?debug=1.
  • 🕵️ Check for sensitive data exposure.

2. Fuzzing for Undocumented APIs 🤔💥

🛠️ Tool: ffuf 🛠️

🧪 Method: Brute-force directories and API endpoints using wordlists.

💻 Example Command:

ffuf -u https://target.com/FUZZ -w wordlist.txt -mc 200,302

💡 Tip: Use custom wordlists for API discovery (e.g., SecLists/API directory).

🔑 What to do after discovery?

  • 🔍 Check for admin panels, beta features, or hidden functionality.
  • 🛠️ Attempt fuzzing with parameters (e.g., ffuf -u https://target.com/api/endpoint?param=FUZZ

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Published in InfoSec Write-ups

A collection of write-ups from the best hackers in the world on topics ranging from bug bounties and CTFs to vulnhub machines, hardware challenges and real life encounters. Subscribe to our weekly newsletter for the coolest infosec updates: https://weekly.infosecwriteups.com/

Written by Abhijeet Kumawat

Radhe Radhe ✨ || Jr. Security Consultant || Security Researcher || Bug Hunter || Web Application Penetration Tester || Ethical Hacker ||

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This article offers a great and practical guide for discovering hidden endpoints, which is essential for uncovering security vulnerabilities. The use of JavaScript analysis and tools like LinkFinder to extract potential endpoints is a clever…

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