Most website management programs advertise its name and version, usually at the bottom of the pages of your website, blog, or forum. This way, it is very easy for a hacker to look online if there is any known security flaw with the particular version of the software you use in order to exploit it, especially if you are running an older version. See an example in Figure 4.
Scroll down your website and see if there is any information of the software you run and/or its versions. You must remove this information as soon as possible. The way this is done will depend on the program you use, and sometimes you will have to pay a fee to get a code that, once entered at your control panel, removes the message from your website.