The wp-schema-pro WordPress plugin before 2.7.16 does not validate post access allowing a contributor user to access custom fields on any post regardless of post type or status via a shortcode
[
{
"vendor": "Unknown",
"product": "wp-schema-pro",
"versions": [
{
"status": "affected",
"versionType": "semver",
"version": "0",
"lessThan": "2.7.16"
}
],
"defaultStatus": "unaffected"
}
]