rm -rf vendor/phpunit/
: Scan your web root for newly created .php files, hidden files, or modified core framework files that could act as backdoors.
The server-side script executes the payload immediately, granting the attacker the privileges of the web server user (e.g., www-data ). index of vendor phpunit phpunit src util php eval-stdin.php
Ensure that your production server does not have development dependencies installed. Use the --no-dev flag during deployment: composer install --no-dev .
Show you to block access.
Context and likely origin
Remember: security is a process, not a one‑time fix. Stay vigilant, and never assume that a file is harmless just because it came from a well‑known library. The path vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php belongs in your security blacklist—and, hopefully, nowhere else. rm -rf vendor/phpunit/ : Scan your web root
If the server returns a blank page (200 OK) or an error indicating it is waiting for input, the file is accessible. If it returns a 404 or 403 error, the file is blocked or missing. 2. Command Line Check (CURL)
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