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Joomla! 1.0.11 is available for download, and it is designated a Critical Security Release.

“All existing Joomla! users must upgrade to this version, due to several high level vulnerabilities that affect all previous Joomla! versions.

1.0.11 contains 4 high level security fixes, 4 medium level, 18 low level and 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.”

For full details, please read the release announcement and the 1.0.11 changelog.