Joomla!是一套在国外相当知名的内容管理系统(Content Management System - CMS)，它属于Portal(企业入口网站)类型，顾名思义，就是比较适合作为商业类型的网站程序。它是开源的！Joomla!是使用PHP语言加上 MySQL数据库所开发的软件系统，可以在Linux、Windows、MacOSX等各种不同的平台上执行。
Security
Several security issues were fixed in this release. There was 1 critical, 1 major and 2 moderate security vulnerabilities fixed in 1.5.7. For more information, visit the Security Center.
Articles
com_content: Metadata handling; Alias not copied for Articles
String Escaping: External links; Titles; Alt tags missing on images
Blog Layout: Article Page break; new Left-to-Right option; Breadcrumbs; Archive Intro Text formatting issues; Section Blog Article links
Submit Article: Article Order Drop-Down List on Front End Shows Archived and Trashed Articles; Preview edited Article does not use Template Editor.css
RSS Feed: Publish Date fix; External URLs rendering incorrectly
SEO: Index and Follow Meta Tag for Print View
Modules
Show_noauth problem; Module Deletion after uninstall; Colspan in mod_latest; Copy Newsflash Module
Name and Username in mod_login; Menu item is locked after closing
Search: Textfield Width Parameter; Show Search Results option; Category Search
Legacy
Menu Access Rights Corrections; Menu Separator shows as Link
Templates
Beez: Contact Image; Typo in Attribute value; Newsflash Article URL
ja_purity: e-Mail and Print Button files; Default Article Layout does not display Edit Icon for Authors; Site Logo Text goes under Header background; Top menu
Administrator
$row is not Initialized
Help: Latest Version check; Help Key Reference Update for Modules: New Screen
Configuration: Time Zone correction
Media Manager: Base path missing slashes
Sample Content: Outdated Links in "Welcome to Joomla", Newsfeed Fixes, several updated articles and statistics
Installation: Remove confusing error message about language files for extension installations
System
IIS 6 and IIS 7: JRoute::_() and Application Redirect() fixes
Parameter Types: SQL, Textarea for Templates
E-mail: JMail class ignores JConfig.sendmail path for sendmail; Incorrect SEF URLs for outgoing recommendation e-mails
API: JHTMLSelect fix; queryBatch logging in debug mode; JSite::getParams(); strpos(); setMetadata creates duplicate meta tags; $row is not initialized
XML-RPC client ID is too high; Profiling J1.5 framework; $row is not initialized
Cache: JCacheStorageFile::gc flawed logic in cache expiry; Clean Cache file with Cache Manager
