Flight is an extensible micro-framework for PHP. Prior to 3.18.1, the make:controller CLI command calls mkdir(..., recursive: true) on a path built from the user-supplied controller name, before Nette's class-name validation runs. The class-file write is correctly rejected by Nette when the name contains /, but the recursive directory creation side effect is already committed — including directories located outside the project root through ../ traversal. This vulnerability is fixed in 3.18.1.

Affected: Packagist: flightphp/core

### Summary The `make:controller` CLI command calls `mkdir(..., recursive: true)` on a path built from the user-supplied controller name, **before** Nette's class-name validation runs. The class-file write is correctly rejected by Nette when the name contains `/`, but the recursive directory creation side effect is already committed — including directories located outside the project root through `../` traversal.

### Affected code `flight/commands/ControllerCommand.php` (≈ 63-66):

```php if (is_dir(dirname($controllerPath)) === false) { $io->info('Creating directory ' . dirname($controllerPath), true); mkdir(dirname($controllerPath), 0755, true); // un-normalized, runs before validation } ```

### Proof of concept ``` $ php vendor/flightphp/runway/runway make:controller '../../../../tmp/CONTROLLER_TRAVERSAL_TEST/pwn' Creating directory .../app/controllers/../../../../tmp/CONTROLLER_TRAVERSAL_TEST Nette\InvalidArgumentException: Value '../../../../tmp/CONTROLLER_TRAVERSAL_TEST/pwnController' is not valid class name.

$ ls /home/user/tmp/CONTROLLER_TRAVERSAL_TEST (directory exists — created before the exception was thrown) ```

### Impact - **Arbitrary directory creation outside the project root**, executable by any local actor that can run the Flight CLI (developer machine, shared CI build agent, compromised dev container). - Primes log-file planting for chained LFI exploitation (e.g. creating a directory where an attacker can later drop a `.php` file to be includ…