WWBN AVideo is an open source video platform. In versions up to and including 26.0, the `objects/import.json.php` endpoint accepts a user-controlled `fileURI` POST parameter with only a regex check that the value ends in `.mp4`. Unlike `objects/listFiles.json.php`, which was hardened with a `realpath()` + directory prefix check to restrict paths to the `videos/` directory, `import.json.php` performs no directory restriction. This allows an authenticated user with upload permission to: (1) steal any other user's private video files by importing them into their own account, (2) read `.txt`/`.html`/`.htm` files adjacent to any `.mp4` file on the filesystem, and (3) delete `.mp4` and adjacent text files if writable by the web server process. Commit e110ff542acdd7e3b81bdd02b8402b9f6a61ad78 contains a patch.

Affected: Packagist: wwbn/avideo

## Summary

The `objects/import.json.php` endpoint accepts a user-controlled `fileURI` POST parameter with only a regex check that the value ends in `.mp4`. Unlike `objects/listFiles.json.php`, which was hardened with a `realpath()` + directory prefix check to restrict paths to the `videos/` directory, `import.json.php` performs no directory restriction. This allows an authenticated user with upload permission to: (1) steal any other user's private video files by importing them into their own account, (2) read `.txt`/`.html`/`.htm` files adjacent to any `.mp4` file on the filesystem, and (3) delete `.mp4` and adjacent text files if writable by the web server process.

## Details

### Missing path restriction in import.json.php

At `objects/import.json.php:12`, the only validation on the user-supplied `fileURI` is a regex ensuring it ends with `.mp4`:

```php // objects/import.json.php:12 if (!preg_match("/.*\\.mp4$/i", $_POST['fileURI'])) { return false; } ```

Compare this to the hardened `listFiles.json.php:16-28`, which was patched to restrict paths:

```php // objects/listFiles.json.php:16-28 $allowedBase = realpath($global['systemRootPath'] . 'videos'); // ... $resolvedPath = realpath($_POST['path']); if ($resolvedPath === false || strpos($resolvedPath . '/', $allowedBase) !== 0) { http_response_code(403); echo json_encode(['error' => 'Path not allowed']); exit; } ```

The same fix was never applied to `import.json.php`.

### Attack Primitive 1: File con…