See how secure custom fields compares to other vendors in security performance
The Secure Custom Fields WordPress plugin before 6.3.9, Secure Custom Fields WordPress plugin before 6.3.6.3, Advanced Custom Fields Pro WordPress plugin before 6.3.9 does not prevent users from running arbitrary functions through its setting import functionalities, which could allow high privilege users such as admin to run arbitrary PHP functions.
In Advanced Custom Fields (ACF) before 6.3.9 and Secure Custom Fields before 6.3.6.3 (plugins for WordPress), using the Field Group editor to edit one of the plugin's fields can result in execution of a stored XSS payload. NOTE: if you wish to use the WP Engine alternative update mechanism for the free version of ACF, then you can follow the process shown at the advancedcustomfields.com blog URL within the References section below.