Moodle 2.2.10, 2.3.7, 2.4.4, and 2.5 were released yesterday. Moodle 2.5 introduces badges, usability improvements, and a Bootstrap based theme. The other versions include “small improvements”, bug fixes, and security fixes. Details of the security vulnerabilities fixed in those versions will be released later.
Update (May 21, 2013): Moodle has now released information on the security issues fixed in the releases. Moodle 2.2.10 fixes one serious security vulnerability and two minor security vulnerabilities. Moodle 2.3.7 and 2.4.4 fix two serious security vulnerabilities and three minor security vulnerabilities.
More information is available in the release notes for 2.2.10, 2.3.7, 2.4.4, and 2.5