confusing error message about "x_ values"

[ElectricNroff]

When using the "POST /cve/:id/cna" endpoint with a file that begins with:

{"cnaContainer": {
        "x_a": {"$b": "c"},
        "x_exploit_price": "$5000.00",

the error message is:

A problem occurred while saving the CVE Record, ensure that x_ values do not start with $

Here, $5000.00 is a value, and it is allowed to begin with a $ character. The only problem is that a name - $b in this example - is not allowed to begin with a $ character.

The error message could be reworded to something like:

A problem occurred while saving the CVE Record; ensure that field names within x_ data structures do not start with $

Optionally, the word field could be omitted, because it is not used in the JSON documentation:

https://www.rfc-editor.org/rfc/rfc8259

    An object structure is represented as a pair of curly brackets
   surrounding zero or more name/value pairs (or members).  A name is a
   string.  A single colon comes after each name, separating the name
   from the value.