: This is the default folder created by Composer, PHP’s package manager, where third-party packages, libraries, and frameworks are stored.
Ensure your vendor folder is NOT inside your public web root (e.g., public_html or www ). It should be one level above. : This is the default folder created by
This file is intended for — specifically, to allow PHPUnit to evaluate code in a separate PHP process. However, if this file is accidentally exposed on a production web server, an attacker can: This file is intended for — specifically, to
A basic verification payload to check for vulnerability might look like this: Once found, attackers look for the specific nested
Even if directory indexing is disabled, the file might still be accessible if an attacker guesses the full path. Many vulnerable applications left the entire vendor folder inside the web root – a disastrous practice.
Once found, attackers look for the specific nested path: /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php .