A vulnerability has been found by Sucuri in the WP-Slimstat plugin, which affects all versions up to 3.9.5. The vulnerability may allow attackers to inject SQL commands into your database, allowing them to make arbitrary changes.
If you use the WP-Slimstat plugin, we strongly recommend that you update to version 3.9.6 as soon as possible. You can update this plugin by visiting Dashboard → Updates in your WordPress dashboard, selecting WP-Slimstat, and clicking the Update Plugins button.
As always, drop us a line if you have any questions or need any help!