Mambo 4.6.5, codename "Jupiter", has been released. This is a maintenance and security release which fixes some potentially serious security vulnerabilities affecting all earlier versions of 4.6. It is recommended that all 4.6+ users update to 4.6.5 as soon as possible. Instructions for upgrading are included in the release, which you can download from the Mambo Code Forge here.
Please see the Security Forum for details of these security issues.