Web site hacked

Our web site has been hacked many time over the last few months. The hacker only puts links to other site in our html code. We changed the password many time but we are still finding bad code in our main index page and other pages on the site.

We have verion 1.7.4 Is it possible for the hacker to come through the guestbook?

Thanks

Version 1.7.4? Are we talking about Lazarus? If so please use the Lazarus Site. Anyway Lazarus 1.7.4 has no exploits I am aware of. When you say they added links can you explain where etc and provide a link to your site.

Yes, it's Lazarus

We removed the links, there were in the home page index.html . Would it be possible for someone to come through the guestbook and change the HTML code of the web site? I’m just trying to find how our main page was hacked and was wondering if the guestbook could have been a possible doorway to a hacker.

Thanks

They could of come in through a different script or may even be on the same server. Either way you should update to 1.8.