There is a new Maintenance and Security Release for WordPress. The new version is version 3.5.1.
It fixes 3 quite serious issues :
- A server-side request forgery vulnerability and remote port scanning using pingbacks. This vulnerability, which could potentially be used to expose information and compromise a site, affects all previous WordPress versions.
- Two instances of cross-site scripting via shortcodes and post content.
- A cross-site scripting vulnerability in the external library Plupload.
More information can be found here – http://wordpress.org/news/2013/01/wordpress-3-5-1/