echo "<?php echo 'Hello World!';" | phpunit --eval-stdin
If you have stumbled upon the search query in your server logs or while performing a security audit, you are likely looking at evidence of an automated scanner or a legacy vulnerability within a PHP application. echo "<
vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php is associated with a critical Remote Code Execution (RCE) vulnerability ( CVE-2017-9841 ) that remains a common target for automated bots today. When exposed on a live web server, it
In the cybersecurity world, this specific file is infamous. When exposed on a live web server, it acts as a direct backdoor, allowing attackers to execute arbitrary PHP code remotely (RCE - Remote Code Execution). Require all denied <
The eval-stdin.php file was designed to take PHP code from stdin and execute it. In certain versions, this file was accessible via a direct URL request if the vendor folder was located within the web root.
<DirectoryMatch "vendor"> Require all denied </DirectoryMatch>
If this file is accessible via a web browser (an "Index of" page or direct URL), it indicates that your server's vendor folder is exposed to the public internet, which is a significant security risk. Why This File is Dangerous