Check What Version of Joomla You Are Running
Updated: December 18, 2013
The version number of the currently installed version of Joomla is listed in several places.
In the administration interface of Joomla you can see what version you are running. In Joomla 1.5 the version is listed in the upper right hand corner of the pages. In Joomla 1.0, 1.6, 1.7, and 2.5 it is listed at the bottom of the pages. The version is also listed in the System Info page. In Joomla 3.0 the version is listed on the System Information page.
In the root directory of the Joomla installation the CHANGELOG.php lists the version number.
Current Versions of Joomla
2.5.17 and 3.2.1