Both of these releases also contain provide bug-fixes and low-level security patches, so it's worth updating quickly. The update process is very simple, you can read complete instructions at here.
Joomla 2.5.9 is a security with contains about 22 tracker issues fixed and 1 low priority security fix (Low Priority - Core - Information Disclosure)
Click here to read more detail about Security Issues Fixed in Joomla 2.5.9.
Joomla 3.0.3 includes 3 security issues fixed - Low Priority - Core (Method of encoding search terms led to possible information disclosure. Coding errors led to an information disclosure in some situations. Undefined variable caused information disclosure in some situations) and 136 tracker issues fixed. To read more detail about Tracker Issues Fixed, click here!
In addtion, 3.0.3 also has two improvements languages features in 3.0.3 :
- Language Installation tool for the Joomla Installer. This tool help user automatically adds languages as installing Joomla. Click here to know how to use.
- The improvement in Multilanguage: adding items associations in remaining core components. With this feature, the user can greater control over what is displayed when you switch languages. Click here to read more.