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The Joomla! Project now announces the immediate release of Joomla! 1.0.15 [Daytime]. This release addresses a security vulnerability and it is recommended that you upgrade immediately. Begin by testing on a backup copy of your site. Once you have verified that your site works as expected, backup your live site and upgrade as soon as possible.

Please read the full announcement which contains upgrade instructions here: http://www.joomla.org/content/view/4609/1/