What are you running (Apache, Nginx, IIS)?
If an immediate upgrade is not possible, at least delete or rename eval‑stdin.php :
If the file exists and the server is vulnerable, the command executes instantly. The server will respond with the name of the system user running the web service (such as www-data ). Once an attacker confirms execution, they typically download a persistent webshell, steal database credentials from .env files, or deploy ransomware. How to Check if Your Server is Vulnerable
CVE-2017-9841.yaml - projectdiscovery/nuclei-templates - GitHub index of vendor phpunit phpunit src util php evalstdinphp
If PHPUnit is not needed for runtime (and it almost never is), remove it entirely:
: PHPUnit versions before 4.8.28 and 5.x before 5.6.3 .
Deny from all Use code with caution. For Nginx (Add to your server configuration block): location /vendor/ deny all; return 404; Use code with caution. Conclusion What are you running (Apache, Nginx, IIS)
But the safest approach is to not have it at all.
. This flaw allows unauthenticated attackers to execute arbitrary PHP code on a server. Understanding the Vulnerability The issue stems from a utility script in the
The vulnerability was discovered in 2016, and the fix has been available ever since. Yet, misconfigured servers continue to expose this file, and attackers continue to exploit it. The only way to stay safe is to treat the vendor/ directory as untouchable by the web server, to patch PHPUnit to a safe version, and to treat every index of listing as an urgent security incident. Once an attacker confirms execution, they typically download
If you find eval-stdin.php exposed on your production server, take immediate action:
: Ensure that development dependencies are not included in your production build. Use composer install --no-dev when deploying.
The best solution is to update PHPUnit to a version where this file has been removed or secured (versions 4.8.28, 5.6.3, or higher). Run composer update phpunit/phpunit to ensure you are on a safe version. 2. Remove the /vendor Directory from Public Access