Sylius is an open source eCommerce platform. In versions prior to 1.9.10, 1.10.11, and 1.11.2, it is possible to upload an SVG file containing cross-site scripting (XSS) code in the admin panel. In order to perform a XSS attack, the file itself has to be open in a new card or loaded outside of the IMG tag. The problem applies both to the files opened on the admin panel and shop pages. The issue is fixed in versions 1.9.10, 1.10.11, and 1.11.2. As a workaround, require a library that adds on-upload file sanitization and overwrite the service before writing the file to the filesystem. The GitHub Security Advisory contains more specific information about the workaround.

Affected: Packagist: sylius/sylius

### Impact There is a possibility to upload an SVG file containing XSS code in the admin panel. In order to perform an XSS attack, the file itself has to be opened in a new card (or loaded outside of the IMG tag). The problem applies both to the files opened on the admin panel and shop pages.

### Patches The issue is fixed in versions: 1.9.10, 1.10.11, 1.11.2, and above.

### Workarounds If there is a need to upload an SVG image type, on-upload sanitization has to be added. The way to achieve this is to require a library that will do the trick:

``` composer require enshrined/svg-sanitize ```

The second step is all about performing a file content sanitization before writing it to the filesystem. It can be done by overwriting the service:

```php <?php

declare(strict_types=1);

namespace App\Uploader;

use enshrined\svgSanitize\Sanitizer; use Gaufrette\Filesystem; use Sylius\Component\Core\Generator\ImagePathGeneratorInterface; use Sylius\Component\Core\Generator\UploadedImagePathGenerator; use Sylius\Component\Core\Model\ImageInterface; use Sylius\Component\Core\Uploader\ImageUploaderInterface; use Symfony\Component\HttpFoundation\File\File; use Webmozart\Assert\Assert;

final class ImageUploader implements ImageUploaderInterface { private const MIME_SVG_XML = 'image/svg+xml'; private const MIME_SVG = 'image/svg';

/** @var Filesystem */ protected $filesystem;

/** @var ImagePathGeneratorInterface */ protected $imagePathGenerator;

/** @var San…