cross domain cms <->hosting

[30equals]

i'm planning to set up a self build cms on my server.
now, it should only be installed on my server - and other folks should be able to use it, with images, etc.. hosted on their own server. so a cross domain cms i guess you can call it.

the reason for this is, that i only need to update the system once if i made adaptions, so noone needs to install a new version or something.

i was wondering if there are extra security risks involved in this.
and if it's recommended at all.
and any tips are welcome of course.

i know there are loads of open source cms available, but i need to improve my php skills, so this is a good project. i already made a simple cms , so i'm not an entire n00b

thanx.

[rulian]

issues that could arise is being able to access their servers via remote access or a vise versa, some servers dont allow for that.

Also, if their site needs to access your server for it to work,and something happens to your server, alot of other people's site goes down, so you'll definately want some kind of redundancy.

Other then that, its simply a matter of making it easy for them to access your server, if your doing file uploads you'll need access to theirs as well.

With the internet, there is always security issues, if your have info for other peoples server be sure to protect it well, on a part of your database that isnt the shared public one.

Other then that, its really about tackling individual problems you'll find with compability and other, such as different PHP version and so fourth.