: Only install "require-dev" packages (like PHPUnit) on local or staging environments. Use composer install --no-dev on production.

rm -rf vendor/phpunit/

The vendor directory (managed by Composer) should be in your web root.

If you are investigating a breach, search your access logs for that exact path:

In PHPUnit (versions 6.x through 9.x), this file is a small wrapper script used for of PHP code. It reads PHP code from standard input and evaluates it.

: The specific path to the vulnerable script within the PHPUnit framework.

Ensure you are using the --no-dev flag when installing dependencies on your production server: composer install --no-dev --optimize-autoloader Use code with caution.

: Ensure your /vendor directory is not accessible via the browser. You can do this by moving it outside the web root or adding a restriction in your configuration.

Once located, the attacker can leverage tools like curl to exploit the server: curl -d "" http://example.com Use code with caution.

Here is a detailed breakdown of what this means, why it is a risk, and how to fix it. What is evalstdin.php ?

refers to a critical Remote Code Execution (RCE) vulnerability identified as CVE-2017-9841