It has happened several times the last weeks that a new user har been registered even though my site is not open for registering new useres. The users have no role. They all have a gmail adress, the last one is yooyopzzovyy@gmail.com. According to SpamBusted.com it is a spammer with cineese IP-adress. There is however no spam in comments or posts.
Ho can this happen and how do I stop it?
I run WordPress 3.3.1, the Artisteer 3.1 theme and the latest version of the following plugins:
Aksimet
All in One SEO PAck
CMS Tree Page View
Contact form 7
Enhanced Meta Widget
Facebook Likes It
Favicons
Google Analyticator
Google Doc Embedder
Google XML Sitemap
My Page Order
NextGEN Gallery
Really Simple CAPTCHA
SI CAPTHA Anti-Spam
Subscribe to comments reloaded
Table of contents plus
Transposh Translation Filter
WordBooker
WordPress Download Monitor
WordPress Portfolio plugin
WP-DBManager
The intruded site is Ulfsby.no