The remote host is missing an update to mahara announced via advisory DSA 1822-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201822-1

It was discovered that mahara, an electronic portfolio, weblog, and resume builder is prone to several cross-site scripting attacks, which allow an attacker to inject arbitrary HTML or script code and steal potential sensitive data from other users. The oldstable distribution (etch) does not contain mahara. For the stable distribution (lenny), this problem has been fixed in version 1.0.4-4+lenny3. For the testing distribution (squeeze), this problem will be fixed soon. For the unstable distribution (sid), this problem has been fixed in version 1.1.5-1. We recommend that you upgrade your mahara packages.