Wordfence is reporting a security vulnerability but the link for explanation is broken. The advise from Wordfence is to deactivate and remove the plugin until there is an update. More information I don’t have.
I’m happy to inform you that I’ve released the updated version 1.6 of this plugin today which tightened the security, by checking CSRF when saving the plugin options/settings.
I appreciate you trying the latest version 1.6 of WP Super Minify and sharing your thoughts. I’m going to update Wordfence team and Patchstack team regarding the same now.