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EUVD-2026-317250

fkie_cve-2026-43873

WWBN AVideo is an open source video platform. In versions up to and including 29.0, plugin/CloneSite/cloneClient.json.php echoes the local CloneSite shared secret ($objClone->myKey, a constant md5($global['systemRootPath'] . $global['salt'])) into the HTTP response body on every unauthenticated request. The unauthenticated error branch was intended to reject non-admin callers without a valid key, but the rejection message interpolates the expected key before die(). When the victim has CloneSite configured with a remote cloneSiteURL (standard federation/backup setup), the leaked myKey is exactly the credential that authenticates the victim to that remote server's cloneServer.json.php, allowing the attacker to impersonate the victim and trigger a full mysqldump of the remote's database to the remote's public videos/clones/ directory Commit e6566f56a28f4556b2a0a09d03717a719dcb49da contains an updated fix.

GHSA-qm9p-p5pw-jrx2 — AVideo: Unauthenticated Disclosure of CloneSite `myKey` via Error Echo in `cloneClient.json.php` Enables Cross-Site DB…

Affected: Packagist: wwbn/avideo

## Summary

`plugin/CloneSite/cloneClient.json.php` echoes the local CloneSite shared secret (`$objClone->myKey`, a constant `md5($global['systemRootPath'] . $global['salt'])`) into the HTTP response body on every unauthenticated request. The unauthenticated error branch was intended to reject non-admin callers without a valid key, but the rejection message interpolates the expected key before `die()`. When the victim has CloneSite configured with a remote `cloneSiteURL` (standard federation/backup setup), the leaked `myKey` is exactly the credential that authenticates the victim to that remote server's `cloneServer.json.php`, allowing the attacker to impersonate the victim and trigger a full `mysqldump` of the remote's database to the remote's public `videos/clones/` directory.

## Details

### 1. The leak (`plugin/CloneSite/cloneClient.json.php:51-60`)

```php $objCloneOriginal = $objClone; $argv[1] = preg_replace("/[^A-Za-z0-9 ]/", '', empty($argv[1])?'':$argv[1]);

if (empty($objClone) || empty($argv[1]) || $objClone->myKey !== $argv[1]) { if (!User::isAdmin()) { $resp->msg = "You can't do this"; $log->add("Clone: {$resp->msg}"); echo "$objClone->myKey !== $argv[1]"; // <-- interpolates myKey die(json_encode($resp)); } } ```

Under PHP's web SAPI, the script-scope `$argv` global is not populated from the query string (only `$_SERVER['argv']` is populated, and only when `register_argc_argv=On`). Verified on this host (PHP 8.4.16,…