The body of the POST request contains malicious PHP code, such as or commands to download a web shell.
This prevents PHPUnit and other development‑only packages from being deployed.
// Vulnerable code logic in eval-stdin.php eval(file_get_contents('php://input')); Use code with caution.
function runPhpunitTest($testFile) // Path to PHPUnit's eval-stdin.php utility $phpunitUtilPath = __DIR__ . '/vendor/phpunit/phpunit/src/util/php/eval-stdin.php';
However, in older versions of PHPUnit (specifically before 4.8.28 and 5.x before 5.6.3), this script was improperly exposed in the vendor directory, making it accessible via HTTP requests. The Security Vulnerability: CVE-2017-9841
Security implications
An attacker can send a crafted HTTP POST request to this file, executing arbitrary PHP code on the server without authentication. Severity: 9.8 Critical (CVSS v3).
9.8 (Critical) CWE: CWE-94 (Improper Control of Generation of Code) Known Exploit DB ID: EDB-ID: 46320
# On development/staging: composer install
Given the path "vendor/phpunit/phpunit/src/util/php/eval-stdin.php" , it seems like you're working within a Composer-managed project, where PHPUnit is installed as a dependency.