Drupal 6.5 and Drupal 5.11 were released yesterday.  These new versions of Drupal are maintenance releases fixing problems reported using the bug tracking system, as well as critical security vulnerabilities.  If you take a look at the release notes, you'll find that Drupal's core developers and security teams have been hard at work improving this open source content management system.  With all the hard work done for you, it only makes sense to upgrade your Drupal site today (yes, we're running Drupal 6.5).

Details and download links can be found at Drupal.org.  

Joomla.org: "The Joomla! community is pleased to announce the immediate availability of Joomla! 1.5.5 [Mamni]. This is a quick turnaround release to address the Duplicate Title error from 1.5.4 . This release also contains important SEF URL improvements and fixes for com_content in addition to a number of bug fixes and improvements. It has been nearly three weeks since Joomla! 1.5.4 was released on July 8, 2008. The Development Working Group 's goal is to continue to provide regular, frequent updates to the Joomla! community."

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"Big Medium 2.0.3 is now ready for your downloading pleasure, featuring a tasty selection of changes and bug fixes. The update addresses a few lingering compatibility issues with Firefox 3, fixes a nasty bug that caused a small number of Big Medium sites to refuse to open in Internet Explorer, and several other issues."

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Joomla! 1.5.4 was released yesterday.

The Joomla! community is pleased to announce the immediate availability of Joomla! 1.5.4 [Naiki]. This is a normal maintenance release which includes a few low to moderate security issues, many bug fixes, and several very nice improvements. It has been a little over ten weeks since Joomla! 1.5.3 was released on April 24, 2008. The Development Working Group's goal is to continue to provide regular, frequent updates to the Joomla! community containing the latest bug fixes and minor enhancements.

Click here for details.

Moodle.org: "Moodle 1.9.1 was recently released and is recommended as an upgrade for all Moodle users. There were no security bugs but over 400 issues were dealt with and there are a few minor new features, such as support for captcha during email registration."

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The latest release in the 3.x series is ready. This release adds more
portlet types, browserlayer integration, and fixes OpenID and RSS bugs.
It also introduces protection against CSRF vulnerabilities in the core.

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mojoPortal.com: "The main focus of this release is making mojoPortal more attractive,
with the addition of 21 good looking new skins for a total of 34 skins
now included with mojoPortal. There were also a few minor bug fixes for
things reported in the Forums since the last release."

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The PHP development team started the month of May with the release of PHP 5.2.6. With over 120 bug fixes, this release is mainly focused on stability. There are however several security enhancements in PHP 5.2.6:

• Fixed possible stack buffer overflow in the FastCGI SAPI identified by Andrei Nigmatulin.
• Fixed integer overflow in printf() identified by Maksymilian Aciemowicz.
• Fixed security issue detailed in CVE-2008-0599 identified by Ryan Permeh.
• Fixed a safe_mode bypass in cURL identified by Maksymilian Arciemowicz.
• Properly address incomplete multibyte chars inside escapeshellcmd() identified by Stefan Esser.
• Upgraded bundled PCRE to version 7.6

References: Release Announcement, PHP 5.2.6 ChangeLog, PHP.net Download page