<?php eval('?>' . file_get_contents('php://stdin'));
Here is a simplified example of how an attacker can exploit this: ' . file_get_contents('php://stdin'))
Create a .htaccess file inside your /vendor/ folder with the following content: Deny from all Use code with caution. ' . file_get_contents('php://stdin'))
The path vendor/phpunit/phpunit/src/util/php/eval-stdin.php refers to a critical Remote Code Execution (RCE) vulnerability known as . This flaw allows unauthenticated attackers to execute arbitrary PHP code on a server by sending a specially crafted HTTP POST request to that specific file. What is CVE-2017-9841? ' . file_get_contents('php://stdin'))
Because attackers scan for this file automatically, its exposure suggests your server may have already been targeted.
If you find an exposed eval-stdin.php on a third-party website: