You Can Find Race Condition Vulnerabilities ✨

Try to understand what it is:
This vulnerability occurs when a system's behavior depends on the timing of concurrent operations, allowing attackers to gain unauthorized access or perform unauthorized actions.

The main concept to exploit it is by abusing functionality where a web application handles a sensitive action through multiple simultaneous requests. If the backend is vulnerable, it may process your malicious request alongside a legitimate one at the same time!

You can find this vulnerability in the following functionalities of web applications:

1. User Account Creation – Creating multiple accounts using the same email.


2. Account Deletion – Deleting a victim’s account without logging into their account.


3. Email Verification Bypass – Sending the same verification link to both the real and an external email address.


4. Password Reset Flows – Sending a reset link to both the victim’s and attacker’s email addresses simultaneously.


5. Privilege Escalation During Role Assignment – Creating a normal user and assigning admin privileges at the same time using the same email.


6. Coupon/Voucher Redemption – Redeeming the same coupon multiple times before it's marked as used.


7. Payment Processing – Performing multiple payments or withdrawals with insufficient balance.


8. File Upload – Uploading multiple files at the same endpoint simultaneously, potentially triggering remote code execution (RCE).


9. Voting or Rating Systems – Sending multiple votes or ratings at the same time using the same request.


10. Subscription Plan Upgrades – Triggering parallel requests to gain a higher-tier plan without being properly charged.

I will try to share many techniques to find and exploit these functionalities. If you guys enjoy to read this don't forget to react 🔥
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⚡Hello Hunters! Ready to find your first bounty? Try this underrated approach! ✨

Most bug hunters go after common issues like XSS, SQLi, SSRF, CSRF, IDOR, open redirection, CVEs, or use automated scanners. But don't sleep on JavaScript file analysis — it's a goldmine for critical bugs.

Automated tools help extract endpoints and sensitive info, but manual JS review reveals the real logic and flow of the app — things scanners often miss.

Here are vulnerabilities you can find just by reading JS files:

1. Authentication bypass
2. Sensitive info leaks
3. Hardcoded credentials
4. Config/env file disclosure
5. Hidden login portals
6. JWT secrets & API keys
7. Outdated services loed CVE to exploit
8. Dependency confusion
9. File upload endpoints
10. RFI → RCE
11. Open redirection
12. DOM-based XSS
13. WebSocket endpoints
14. Hidden parameters
15. IDOR


Pro tip:

don’t ignore <script> tags in HTML/PHP files — they can might triggered RFI, LFI, and more.

Upcoming posts will reveal step-by-step methodologies for JavaScript file analysis to uncover critical vulnerabilities.
Till then, keep learning, keep exploring.

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