The remote host is missing an update to mahara announced via advisory DSA 2334-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202334-1

Several vulnerabilities were discovered in Mahara, an electronic portfolio, weblog, and resume builder: CVE-2011-2771 Teemu Vesala discovered that missing input sanitising of RSS feeds could lead to cross-site scripting. CVE-2011-2772 Richard Mansfield discovered that insufficient upload restrictions allowed denial of service. CVE-2011-2773 Richard Mansfield that the management of institutions was prone to cross-site request forgery. (no CVE ID available yet) Andrew Nichols discovered a privilege escalation vulnerability in MNet handling. For the oldstable distribution (lenny), this problem has been fixed in version 1.0.4-4+lenny11. For the stable distribution (squeeze), this problem has been fixed in version 1.2.6-2+squeeze3. For the unstable distribution (sid), this problem has been fixed in version 1.4.1-1. We recommend that you upgrade your mahara packages.