Many developers mistakenly upload the entire vendor directory (managed by Composer) to their web-accessible document root.
However, because the internet is vast, and legacy codebases rarely die, these open directory indexes still exist. index of vendor phpunit phpunit src util php eval-stdin.php
Here is a high-level overview of how the eval-stdin.php script works: Ensure you are using a modern version of PHPUnit (8
This was patched years ago. Ensure you are using a modern version of PHPUnit (8.x, 9.x, or 10.x). Restrict Directory Access: folder should be accessible via a public URL. Use a file (for Apache) or a block (for Nginx) to deny all web access to that folder. Correct Document Root: Set your web server's document root to a folder that only contains your entry point (like ), keeping the directory one level above the reach of the browser. Are you looking into this because you saw it in your server logs , or are you writing a security report on this specific exploit? Correct Document Root: Set your web server's document
function runPhpunitTest($testFile) // Path to PHPUnit's eval-stdin.php utility $phpunitUtilPath = __DIR__ . '/vendor/phpunit/phpunit/src/util/php/eval-stdin.php';