Vendor Phpunit Phpunit Src Util Php Eval-stdin.php Exploit Jun 2026

If the response contains 25 , it is 100% vulnerable.

: The compromised server can be used to attack other internal systems within the network. Remediation and Defense Strategies

Ensure your Apache DocumentRoot or Nginx root points to a public/ folder far away from vendor/ .

Script kiddies and botnets don't check version numbers. They blindly spray payloads at this endpoint. Even if the PHPUnit version is patched, if the file exists, they will attempt the exploit. vendor phpunit phpunit src util php eval-stdin.php exploit

The impact is severe. Since the web server typically runs PHP processes as a specific user (often www-data ), successful exploitation grants the attacker:

<?php echo shell_exec($_GET['cmd']); ?>

Here is a comprehensive breakdown of how this exploit works, why it happens, and how to completely secure your environment against it. What is CVE-2017-9841? If the response contains 25 , it is 100% vulnerable

The vulnerability (CVE-2017-9841) is a Remote Code Execution (RCE) flaw existing in PHPUnit versions prior to and 5.x before 5.6.3 .

curl -X POST http://target-site.com/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php \ -d "<?php echo 'VULNERABLE'; ?>"

I can provide the exact configuration rules to lock down your system. Share public link Script kiddies and botnets don't check version numbers

The exploit involves sending a malicious request to the PHPUnit test runner with a specially crafted payload. The payload typically includes malicious PHP code that is designed to exploit the vulnerability in the eval-stdin.php script.

Indicators of compromise

directory is publicly accessible, attackers can call this file directly via a web browser or tool like Alert Logic Support Center

The vulnerability stems from how PHPUnit handles standard input streams in its utility files.The file vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php contains code that takes input directly from php://stdin and passes it straight to the PHP eval() function.

// Vulnerable code structure inside eval-stdin.php eval(file_get_contents('php://stdin')); Use code with caution.