The Secure Custom Fields WordPress plugin before 6.9.8 does not verify that a user is allowed to edit the target object before writing to it during bidirectional relationship synchronization, allowing users with contributor-level access and above to add or remove a reference to their own object on arbitrary posts, users, or terms they cannot otherwise edit.

The Secure Custom Fields WordPress plugin before 6.9.8 does not re-apply its field-group location rules when persisting values submitted through the post editor save path, allowing users with contributor-level access and above to write custom fields the site restricted to administrators onto their own posts.