WWBN AVideo is an open source video platform. In versions up to and including 26.0, the `objects/pluginImport.json.php` endpoint allows admin users to upload and install plugin ZIP files containing executable PHP code, but lacks any CSRF protection. Combined with the application explicitly setting `session.cookie_samesite = 'None'` for HTTPS connections, an unauthenticated attacker can craft a page that, when visited by an authenticated admin, silently uploads a malicious plugin containing a PHP webshell, achieving Remote Code Execution on the server. Commit d1bc1695edd9ad4468a48cea0df6cd943a2635f3 contains a patch.

Affected: Packagist: wwbn/avideo

## Summary

The `objects/pluginImport.json.php` endpoint allows admin users to upload and install plugin ZIP files containing executable PHP code, but lacks any CSRF protection. Combined with the application explicitly setting `session.cookie_samesite = 'None'` for HTTPS connections, an unauthenticated attacker can craft a page that, when visited by an authenticated admin, silently uploads a malicious plugin containing a PHP webshell, achieving Remote Code Execution on the server.

## Details

The root cause has two components working together:

**1. SameSite=None on session cookies (`objects/include_config.php:134-137`):**

```php if ($isHTTPS) { ini_set('session.cookie_samesite', 'None'); ini_set('session.cookie_secure', '1'); } ```

This explicitly allows browsers to include the session cookie on cross-origin requests to the AVideo instance.

**2. No CSRF protection on pluginImport.json.php (`objects/pluginImport.json.php:18`):**

```php if (!User::isAdmin()) { $obj->msg = "You are not admin"; die(json_encode($obj)); } ```

The endpoint only checks `User::isAdmin()` via the session. There is: - No CSRF token validation (the `verifyToken`/`globalToken` mechanism used elsewhere is absent) - No `allowOrigin()` call (contrast with `objects/videoAddNew.json.php` which calls `allowOrigin()` at line 8) - No `Referer` or `Origin` header validation - No requirement for custom headers (e.g., `X-Requested-With`)

The upload form at `view/managerPluginUpload.php` also…