If you have installed WordPress Plugin named ViperBar you must read this post.
The plugin author is not paying attention to ViperBar because of that more than 2100+ user stats, and conversion data is open to everyone, and also plugin directory is indexable so search engines are crawling and indexing stats.php file, this file is returning your site stats in json formating. Google for “your websitename” stats.php ” you’ll be shocked.
To fix this issue replace your stats.php with the code in pastebin link.
The code is commented I hope It’d not be too difficult to fix the issue for you For more help please use the comment form below .