: The script eval-stdin.php uses file_get_contents('php://input') to read the body of a POST request and passes it directly to eval() . This allows an attacker to execute arbitrary PHP code without any authentication.
: Search your access logs for any HTTP POST requests hitting eval-stdin.php .
In 2018–2020, security researchers observed mass scanning campaigns specifically targeting eval-stdin.php . Attack groups have used it to:
The file located at vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php is a utility component included in older versions of PHPUnit (specifically before 4.8.28 and 5.6.3). index of vendor phpunit phpunit src util php eval-stdin.php
Within older versions of PHPUnit, the file eval-stdin.php was included in the source code ( src/util/php/eval-stdin.php ). Its intended purpose was straightforward: it allowed PHPUnit to receive PHP code via standard input ( stdin ) and execute (evaluate) it. This is useful during automated testing environments where code needs to be dynamically run and validated. The Core Vulnerability: CVE-2017-9841
Context and likely origin
Summary
A typical attack lifecycle leveraging this search criteria follows a predictable pattern:
eval-stdin.php is a PHP script that was historically included in older versions of PHPUnit (notably versions 4.x and 5.x). Its purpose is simple: it reads input from the standard input (STDIN) and evaluates it as PHP code using the eval() function.
Note: Many modern Content Management Systems (CMS) and frameworks bundle older versions of PHPUnit within their legacy plugins, extending the lifespan of this vulnerability. How to Fix and Secure Your Server : The script eval-stdin
The issue resides in how PHPUnit—a popular testing framework for PHP—handles input in its utility files. In older versions, the eval-stdin.php file contained code designed to execute raw data received via standard input.
Despite being disclosed in 2017, index of vendor phpunit phpunit src util php eval-stdin.php remains a popular search query among:
PHPUnit itself is not malicious—it is a development dependency. The risk arises when its utility files become accessible to the public internet. Its intended purpose was straightforward: it allowed PHPUnit
