The WP Data Access plugin for WordPress is vulnerable to privilege escalation in versions up to, and including, 5.3.7. This is due to a lack of authorization checks on the multiple_roles_update function. This makes it possible for authenticated attackers, with minimal permissions such as a subscriber, to modify their user role by supplying the 'wpda_role[]' parameter during a profile update. This requires the 'Enable role management' setting to be enabled for the site.
https://plugins.trac.wordpress.org/browser/wp-data-access/tags/5.3.8/WPDataRoles/WPDA_Roles.php#L50
https://plugins.trac.wordpress.org/browser/wp-data-access/tags/5.3.8/WPDataRoles/WPDA_Roles.php#L23
https://plugins.trac.wordpress.org/browser/wp-data-access/tags/5.3.7/WPDataRoles/WPDA_Roles.php#L50
http://packetstormsecurity.com/files/171825/WordPress-WP-Data-Access-5.3.7-Privilege-Escalation.html