CVE-2015-9273
The wp-slimstat (aka Slimstat Analytics) plugin before 4.1.6.1 for WordPress has XSS via an HTTP Referer header, or via a field associated with JavaScript-based Referer tracking.
Date published : 2018-10-07
http://plugins.svn.wordpress.org//wp-slimstat/tags/4.1.6.1/readme.txt