Joomla recently released first version 2.5.21, and then shortly thereafter version 2.5.22 of their awardwinning platform.
We upgraded all affected portals accordingly within hours of these releases.
More info:
J2.5.21 Upgrade: http://tinyurl.com/k5hrh3p
J2.5.22 Upgrade: http://tinyurl.com/mg9qmor