I'm using WP for several blogs. I noticed recently that on 2 of those, the content of my older posts has been edited. An ad with links, obviously for seo reasons, has been added in the middle of my texts (not in the comments).
I'm aware that I likely have a security problem. But do you know what exactly it could be? Weak PW? Old version?
PS: After looking into it I found many other WP Blogs with exactly the same unwished ads in the middle of their posts.
Thanks in advance =)