CVE-2026-48013: Shopware: SSRF in Media External-Link Endpoint Bypasses IP Validation ## Summary The `/api/_action/media/external-link` endpoint allows authenticated admin…

Shopware: SSRF in Media External-Link Endpoint Bypasses IP Validation

## Summary

The `/api/_action/media/external-link` endpoint allows authenticated admin users to make server-side HTTP HEAD requests to arbitrary internal IP addresses. While the parallel `uploadFromURL` flow validates target IPs against private/reserved ranges via `FileUrlValidator`, the `linkURL` flow only performs a URL format check (regex for `http://` or `https://` prefix), allowing SSRF to internal network services and cloud metadata endpoints.

## Details

The vulnerability is an inconsistency between two URL-handling flows in `MediaUploadService`.

**Vulnerable path** (`external-link`):

`MediaUploadV2Controller::externalLink()` at `src/Core/Content/Media/Api/MediaUploadV2Controller.php:66` takes a user-supplied `url` parameter and passes it to `MediaUploadService::linkURL()` at `src/Core/Content/Media/Upload/MediaUploadService.php:134`.

`linkURL()` calls `getContentSizeFromValidExternalUrl($url)` at line 159, which only validates via `validateExternalUrl()`:

```php
// src/Core/Content/Media/Upload/MediaUploadService.php:207-212
public static function validateExternalUrl(string $url): void
{
if (!preg_match('/^https?:\/\/.+/', $url)) {
throw MediaException::invalidUrl($url);
}
}
```

Then makes a server-side HEAD request with no IP filtering:

```php
// src/Core/Content/Media/Upload/MediaUploadService.php:292-300
private function getContentSizeFromValidExternalUrl(string $url): int
{
$this->validateExternalUrl($url);

$headers = $this->httpClient->request('HEAD', $url)->getHeaders();
if (!\array_key_exists('content-length', $headers)) {
throw MediaException::fileNotFound($url);
}

return (int) $headers['content-length'][0];
}
```

**Protected path** (`upload_by_url`):

In contrast, `uploadFromURL` uses `FileFetcher::fetchFromURL()` which calls `FileUrlValidator::isValid()`:

```php
// src/Core/Content/Media/File/FileFetcher.php:64
if ($this->enableUrlValidation && !$this->fileUrlValidato

Affected