We recently fixed some important security issue contain post grid plugin. please update the latest version 3.1.10 (premium) as soon as possible.
Yesterday we reported security alert mail by email@example.com and Robert Mathews, both emails were pointing ajax issue that might use for access data remotely.
And then we got another alert mail from Ipstenu (Mika Epstein) firstname.lastname@example.org, Ipstenu’s mail was so helpful and well explain all issue. you may notice https://wordpress.org/plugins/post-grid/ plugin link is not accessible right now, we take immediate action for the fix issues. we have already update another new version with fixed problem.
I hope it will back as soon as possible.
if you are using premium version please log in to our website http://www.pickplugins.com/my-account/ and download latest version and reinstall.