The vulnerability exists because eval-stdin.php executes whatever PHP code is sent to it without requiring any authentication or verification.
A Google Dork is a search technique that uses advanced search operators to find security vulnerabilities, misconfigurations, and exposed sensitive data on websites. One notorious search query used by security researchers and malicious actors alike is:
: The web server's document root is incorrectly pointed to the root folder of the project instead of the public-facing /public or /web subfolder. How to Check If Your Server Is Vulnerable 1. Manual Path Check index of vendor phpunit phpunit src util php eval-stdin.php
If this file was publicly accessible, assume malicious actors have attempted to exploit it. Inspect your system for signs of a breach:
If you find eval-stdin.php publicly listed The vulnerability exists because eval-stdin
If the file was publicly accessible, assume an attacker has already exploited it. Look for:
This flaw was assigned with a CVSS score of 9.8 (Critical) . It affects PHPUnit versions 4.8.28 and earlier, 5.7.21 and earlier, and 6.4.4 and earlier. The vulnerability was patched in mid-2017, but countless sites remain vulnerable because: How to Check If Your Server Is Vulnerable 1
if (!defined('STDOUT')) // script dies if not in CLI mode
If PHPUnit is deployed on your production server, delete the entire folder. Testing frameworks should never exist in production environments. Run the following command in your terminal: rm -rf /var/www/html/vendor/phpunit Use code with caution. Step 2: Update Composer Dependencies
testing framework that was unintentionally left accessible to the public in many installations. Why This is Significant CVE-2017-9841 Detail - NVD 21 Oct 2025 —
By enforcing strict deployment workflows, disabling directory browsing, and blocking access to dependency directories, you can ensure your web applications remain safe from automated exploitation.