WordPresss acf-to-rest-ap through 3.1.0 allows an insecure direct object reference via permalinks manipulation, as demonstrated by a wp-json/acf/v3/options/ request that can read sensitive information in the wp_options table such as the login and pass values.
View the template here CVE-2020-13700.yaml
References:
https://github.com/ARPSyndicate/cvemon