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Ever Found a Valid Bug/Leaks in JavaScript Files? Part 1

It4chis3c
System Weakness
Published in
5 min readFeb 18, 2025

Practical Techniques to Increase your Chances of Finding Valid Bug/Leaks in Javascript Files

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Hi geeks, it4chis3c (Twitter) came-up with another bounty earning write-up in the Bug Bounty Hunting Series:

Bug Bounty Hunting Series

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Credit: DALL-E

Why Focus on JavaScript Files?

JS files often contain:

  • API Endpoints and Routes: References to internal or external APIs that might not be publicly documented.
  • Hard-coded Credentials: Occasionally, developers embed sensitive information like API keys, tokens, or passwords directly into JS files.
  • Client-Side Logic: Functions that handle data validation, authentication, or other critical operations on the client side.

By scrutinizing these files, you can uncover vulnerabilities such as unauthorized access points, exposed sensitive data, and potential attack vectors.

# Note: If You are following my series and have collected URLs for your target…

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Published in System Weakness

System Weakness is a publication that specialises in publishing upcoming writers in cybersecurity and ethical hacking space. Our security experts write to make the cyber universe more secure, one vulnerability at a time.

Written by It4chis3c

Security Researcher | Bug Bounties | Tips & Tricks

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