Moodle 1.9.19, 2.0.10, 2.1.7, 2.2.4, and 2.3.1 were released today. All of the new versions include bug and security fixes. Details of the security vulnerabilities will be released later. Moodle 2.0.10 is the final 2.0.x version that will be released.
Update (July 19, 2012): Moodle has now released information on the security issues fixed in the releases. Moodle 1.9.19 fixes one minor security vulnerability. Moodle 2.0.10 fixes one serious security vulnerability and four minor security vulnerabilities. Moodle 2.1.7 fixes one serious security vulnerability and eight minor security vulnerabilities. Moodle 2.2.4 fixes two serious security vulnerabilities and nine minor security vulnerabilities. Moodle 2.3.1 fixes one serious security vulnerability and five minor security vulnerabilities.
More information is available in the release notes for 1.9.19, 2.0.10, 2.1.7, 2.2.4, and 2.3.1.
