Oh Great.....
... not only do you have to PAY for the fix (if you are beyond your licence period), version 4 is also the one where they took out the markup editor..... fantasitic.... Confluence is not the only fruit...
Atlassian has warned of a critical security flaw in its Confluence product. All versions of Confluence up to and including 4.1.9 are at risk, the company says, thanks to what it calls an “XML parsing vulnerability” that could lead to “denial of service attacks against the Confluence server” or allow intruders to “read all …