Detected a unquoted template variable as an attribute. If unquoted, a malicious actor could inject custom JavaScript handlers. To fix this, add quotes around the template expression, like this: "{{ expr }}".
<span>{{ $.Scratch.Get "c-title" }}</span><a href="{{ ($.Scratch.Get "c-url") | safeURL }}" target="_blank" rel="external">{{ $.Scratch.Get "c-link-text" | default ($.Scratch.Get "c-title") }}</a>