Certain Composer commands, including
update allow third party code to execute on your system. This is from its “plugins” and “scripts” features. Plugins and scripts have full access to the user account which runs Composer. For this reason, it is strongly advised to avoid running Composer as super-user/root.
You can disable plugins and scripts during package installation or updates with the following syntax so only Composer’s code, and no third party code, will execute:
composer install --no-plugins --no-scripts composer update --no-plugins --no-scripts
exec command will always run third party code as the user which runs
In some cases, like in CI systems or such where you want to install untrusted dependencies, the safest way to do it is to run the above command.