The Joomla! community is pleased to announce the immediate availability of Joomla! 1.5.6 [Vusani]. This is a quick turnaround security release to address a high level security issue and it is recommended all users upgrade immediately.
For more information about this exploit, click here to visit the Joomla Security Blog.
* SECURITY [HIGH] Fixed security hole in reset logic to check for proper token length.
This patch will only update installations of Joomla 1.5.5. If you're using an earlier version, it is recommended you update prior to updating these files.