Joomla! 1.0.11 [ Sunbird ] is now available as of Monday 28th August 2006 24:00 UTC for download here. and is being designated a Critical Security Release.

All existing Joomla! users MUST UPGRADE to this version, due to several High Level vulnerabilities that affect ALL Previous versions of Joomla! 

1.0.11 contains the following critical security fixes:

• 04 High Level Security Fixes
• 04 Medium Level Security Fixes
• 18 Low Level security
  
• 25 General bug fixes

If you are using ANY previous version of Joomla!, you need to upgrade to 1.0.11 as soon as possible.

• 1.0.11 Download
• 1.0.11 Version Information
• 1.0.11 Changelog
  
• 1.0.11 Package File MD5 checksums

Project Joomla! is and has always been fully committed to a Security First Principle and new intiatives have and will continue to be started to reinforce and continue this principle.  Joomla! 1.0.11 highlights a redoubled effort to put Security at the forefront of everyones lexicon.

Like any and all software, security is a continually evolving and constant battle between application developers and hackers.  The increased security threats discovered in the Joomla!Universe indicate nothing more than an increasing usuage of Joomla! throughout the world and thus an increasing interest from hackers. 

It does however serve to remind everyone, both application developers and application users that Security is an eternal vigil and one cannot rest. 

To that end, it is extremely important that everyone take the time to read all of the information contained in this official Joomla! Press Release for Joomla! 1.0.11

More Info Here