GHSA-8HW4-7QJR-3WXG Laravel Backpack CRUD: SingleBase64Image accepts any base64 payload behind a `data:image` prefix — SVG-with-script lands on the public disk

Summary SingleBase64Image::uploadFiles — the uploader bound to image-typed fields via withFiles — only verifies that the submitted value starts with the string data:image. The MIME subtype and the base64-decoded bytes are never inspected or validated. A related bug in FileNameGenerator causes the...