From [url=http://secunia.com/advisories/20122/]Secunia[/url]:
A vulnerability has been discovered in FCKeditor, which potentially can be exploited by malicious people to compromise a vulnerable system.
Fortunately, this should not impact nukeWYSIWYG or RavenNuke users unless the default NukeUser authority has been changed to admin level, which allows uploads. Read More...