EUVD-2026-277428

fkie_cve-2026-33719

WWBN AVideo is an open source video platform. In versions up to and including 26.0, the CDN plugin endpoints `plugin/CDN/status.json.php` and `plugin/CDN/disable.json.php` use key-based authentication with an empty string default key. When the CDN plugin is enabled but the key has not been configured (the default state), the key validation check is completely bypassed, allowing any unauthenticated attacker to modify the full CDN configuration — including CDN URLs, storage credentials, and the authentication key itself — via mass-assignment through the `par` request parameter. Commit adeff0a31ba04a56f411eef256139fd7ed7d4310 contains a patch.

GHSA-r64r-883r-wcwh — AVideo: Unauthenticated CDN Configuration Takeover via Empty Default Key Bypass and Mass-Assignment

Affected: Packagist: wwbn/avideo

## Summary

The CDN plugin endpoints `plugin/CDN/status.json.php` and `plugin/CDN/disable.json.php` use key-based authentication with an empty string default key. When the CDN plugin is enabled but the key has not been configured (the default state), the key validation check is completely bypassed, allowing any unauthenticated attacker to modify the full CDN configuration — including CDN URLs, storage credentials, and the authentication key itself — via mass-assignment through the `par` request parameter.

## Details

The CDN plugin defines a default empty key in `plugin/CDN/CDN.php:68`:

```php $obj->key = ""; ```

The `status.json.php` endpoint authenticates requests using this key, but the check has a critical logic flaw at lines 16-27:

```php // Line 16-19: Requires attacker to provide SOME key value if (empty($_REQUEST['key'])) { $resp->msg = 'Key is empty'; die(json_encode($resp)); }

// Line 21-26: Only validates key IF stored key is non-empty if (!empty($obj->key)) { // When key is "" (default), this is FALSE //check the key if ($obj->key !== $_REQUEST['key']) { $resp->msg = 'Key Does not match'; die(json_encode($resp)); } } ```

When the stored key is the default empty string `""`, `!empty("")` evaluates to `false`, and the entire key comparison block is skipped. Any non-empty value provided by the attacker passes authentication.

Following the bypass, lines 28-31 perform unchecked mass-assignment:

```php $obj->key = $_REQU…

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EUVD-2026-277428

fkie_cve-2026-33719

GHSA-r64r-883r-wcwh — AVideo: Unauthenticated CDN Configuration Takeover via Empty Default Key Bypass and Mass-Assignment