Shopper: same-origin SVG and HTML uploads enable stored XSS and persistent administrator creation

Shopper is a Headless e-commerce Admin Panel. In versions from 2.0.0 prior to 2.10.1 and in the 3.0.0 prereleases beta.1 and beta.2, authenticated back-office staff with a content-upload permission can store executable media on the administrator's own origin. In the 2.x implementation, relevant upload permissions include edit_products or add_brands, and packages/admin/config/media.php allows image/svg+xml in every media collection, including image fields whose image/* validation also accepts SVG. The product files collection in packages/admin/src/Livewire/Components/Products/Form/Files.php has no MIME restriction and accepts text/html as well. Media is served inline from the public disk under /storage/ with its own content type, without Content-Disposition: attachment or a Content-Security-Policy. When an administrator opens an uploaded HTML or SVG file, stored script executes in that administrator's session. In 2.x, the script can invoke packages/admin/src/Livewire/SlideOvers/CreateTeamMember.php, whose store() checks access_setting held by the viewing administrator but trusts client-supplied role_id, to create a new attacker-controlled administrator with a chosen password. This account persists after the uploaded file is deleted and gives access to customer data, orders, settings, and user/role management; the same script can exfiltrate data or grant permissions to the attacker's account. Direct account creation by the low-privileged uploader is blocked, so exploitation requires the administrator to open the file. The 3.x prerelease line already excludes SVG but still allows executable product files. This issue is fixed in versions 2.10.1 and 3.0.0-beta.3.