Ensure your .htaccess or Nginx config prevents users from seeing file lists. For Apache, add Options -Indexes to your configuration.
Attackers look for "Index of" pages or use automated scanners to find this specific path. Once found, they send a request with a PHP payload. Common Payload Example:
An attacker can send a crafted HTTP POST request to the specific URL of the file. The body of the POST request contains the PHP code the attacker wishes to execute.
This path indicates the file is part of a Composer dependency. The vendor directory is the default location for all third-party libraries and packages required by a PHP project.
Update your .htaccess to deny access to the vendor folder. index of vendor phpunit phpunit src util php evalstdinphp
If the eval-stdin.php file was openly accessible on your server, you must assume that automated bots have already attempted to exploit it. Take these forensic actions to ensure system integrity:
Run this command from your web root:
If a server displays an "Index of /vendor" directory listing, attackers can quickly discover the exact path to exploitation.
If the command returns a path like vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php , your installation may be at risk. To test if it is accessible via the web, attempt to curl the file safely: Ensure your
Here's an example of how you might use evalStdin.php :
eval($input);
They send a POST request with a malicious PHP payload in the body. For example:
While exact breach data is often private, this vulnerability has been chained in several high-profile scans: Once found, they send a request with a PHP payload
To secure a system containing this file, immediate action is required.
Web servers with directory listing (or indexing) enabled exacerbate the risk. If an attacker navigates to https://example.com/vendor/ and sees a list of folders like phpunit/ , symfony/ , etc., the server is misconfigured. This not only confirms the presence of PHPUnit but also reveals the entire dependency structure, aiding the attacker in finding other potential vulnerabilities [8†L8-L9].
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