vulnerability?

Permalink
hi,

my server has just been hacked shortly after installing c5 for the first time (a number of index pages were uploaded to domains on the server), we're still trying to find the cause of the issue. i was wondering if the following exploit applies to 5.5 too and if it is worth looking into deeper as a potential cause

http://downloads.securityfocus.com/vulnerabilities/exploits/45685.p...

thanks,

b