The security issue is an XSS exploit discovered by Jeremias Reith that fortunately only affects IP-based virtual servers running on Apache 2.x.
You should always keep your webapp up-to-date. You don’t want to wake up one morning just to find your site full of pharma spam and hidden links, do you? That would be awful
See the full annoucement here and upgrade your Wordpress blog.
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I use by the programs, which I have written itself. Therefore WP I do not put:)