Corsy : CORS Misconfiguration Scanner

Corsy : CORS Misconfiguration Scanner

Corsy is a lightweight program that scans for all known misconfigurations in CORS implementations.


It only works with Python 3 and has the following dependencies:

  • tld
  • requests

To install these dependencies, navigate to the tool directory and execute pip3 install -r requirements.txt


Using it is pretty simple

python3 -u

Scan URLs from a file

python3 -i /path/urls.txt

Number of threads

python3 -u -t 20

Also Read – AntiCheat : Framework To Test Any Anti-Cheat

Delay between requests

python3 -u -d 2

Export results to JSON

python3 -i /path/urls.txt -o /path/output.json

Custom HTTP headers

python3 -u –headers “User-Agent: GoogleBot\nCookie: SESSION=Hacked”

Skip printing tips

-q can be used to skip printing of description, severity, exploitation fields in the output.

Tests implemented

  • Pre-domain bypass
  • Post-domain bypass
  • Backtick bypass
  • Null origin bypass
  • Unescaped dot bypass
  • Invalid value
  • Wild card value
  • Origin reflection test
  • Third party allowance test
  • HTTP allowance test