From Hosting Providers:
"We have detected that you have a vulnerable version of the 'Fckeditor' script in your webspace. This version is vulnerable to attack by third-parties and will allow them to install their own code in your webspace. This will cause your content to be damaged, allow them to infect the computers of visitors to your website, and in extreme circumstances allow the server itself to be compromised.
This is the file that was detected, this should help you find the script location (it might be part of another plugin or script):
This is a *very* serious vulnerability and needs to be dealt with as soon as possible. Inaction may result in your site being taken offline unless we hear from you. "
Advice needed please. [Easy if possible]
I attach copy of the fckeditor.js script