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<IfModule mod_rewrite.c> RewriteEngine On RewriteRule ^vendor/ - [F,L] </IfModule>

: Bots are scanning your site to see if the /vendor/ folder is publicly accessible and if you are running an outdated, vulnerable version of PHPUnit.

from your production web root.

// The script reads from standard input $code = file_get_contents('php://input');

Turn off directory listing to prevent attackers from finding files via "Index of" pages. Options -Indexes Use code with caution. Nginx ( nginx.conf ): autoindex off; Use code with caution. 5. Block Access to the Vendor Directory

A guide on to see if your site is currently exposed.

rm vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php

The appearance of "index of /vendor/phpunit/phpunit/src/util/php/eval-stdin.php" in search results or server logs is a major red flag for web administrators. This specific file path is associated with a critical remote code execution (RCE) vulnerability that allows attackers to take complete control of a web server.

PHPUnit is the most popular testing framework for PHP. When developers use Composer to manage dependencies, PHPUnit is often installed into the vendor directory.