the Gf (Grep Framework).

 It’s a tool that uses pre-defined "patterns" to instantly find URLs that look like they have XSS, SQLi, or SSRF potential.

1. Install Gf and the "Secret Sauce" Patterns

First, install the tool, then download the community patterns that tell it what to look for.

Bash
# Install Gf
go install github.com/tomnomnom/gf@latest

# Create the patterns folder
mkdir -p ~/.gf

# Download the best community patterns
git clone https://github.com/1ndianl33t/Gf-Patterns
cp Gf-Patterns/*.json ~/.gf

2. How to Filter Like a Pro

Now you can take your massive list of endpoints (all_endpoints.txt) and "sift" them for specific bugs:

  • Find XSS targets: cat all_endpoints.txt | gf xss

  • Find SQL Injection targets: cat all_endpoints.txt | gf sqli

  • Find SSRF (Server-Side Request Forgery): cat all_endpoints.txt | gf ssrf

  • Find potential AWS/S3 leaks: cat all_endpoints.txt | gf s3-buckets

🚀 The "Hunting" Checklist: What to Look For

When you look at your filtered results, your eyes should be scanning for these high-value patterns:

Pattern TypeExamples to TargetWhy?
Debug Parameters?debug=true, ?test=1, ?admin=trueOften bypasses authentication or shows error logs.
File Paths?file=, ?path=, ?doc=Could lead to LFI (Local File Inclusion).
Redirects?next=, ?url=, ?redirect_to=Great for Open Redirects or Phishing attacks.
API Versioning/api/v1/, /api/v2/, /internal/Old versions (v1) often have fewer security checks.

💡 A Tip for Success

Don't just look for 200 OK responses. Sometimes a 403 Forbidden is even better—it means there is something valuable there that the developers tried to hide. If you can find a way to bypass that "Forbidden" wall (by changing the HTTP method from GET to POST or adding headers), you’ve found a serious bug!

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