The remote host is missing an update to the system as announced in the referenced advisory.

Update your system with the appropriate patches or software upgrades. http://developer.joomla.org/security/news/308-20100423-core-password-reset-tokens.html http://developer.joomla.org/security/news/309-20100423-core-sessation-fixation.html http://developer.joomla.org/security/news/310-20100423-core-installer-migration-script.html http://developer.joomla.org/security/news/311-20100423-core-negative-values-for-limit-and-offset.html http://www.vuxml.org/freebsd/8d10038e-515c-11df-83fb-0015587e2cc1.html

The following package is affected: joomla15