When WordPress originally announced their latest security update, there were three security fixes. While all security updates can be serious, they didn’t seem too bad. Shortly after, they updated their announcement with a fourth and more serious security problem.
I have looked after the Debian WordPress package for a while. This is the first time I have heard people actually having their sites hacked almost as soon as this vulnerability was announced.
If you are running WordPress 4.7 or 4.7.1, your website is vulnerable and there are bots out there looking for it. You should immediately upgrade to 4.7.2 (or, if there is a later 4.7.x version to that). There is now updated Debian wordpress version 4.7.2 packages for unstable, testing and stable backports.
For stable, you are on a patched version 4.1 which doesn’t have this specific vulnerability (it was introduced in 4.7) but you should be using 4.1+dfsg-1+deb8u12 which has the fixes found in 4.7.1 ported back to 4.1 code.
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