Moodle 1.9.5 and Moodle 1.8.9 – update has been released to patch some security issues. Four serious security vulnerabilities (1 critical, 3 major) have been discovered and fixed recently. There are no reported exploits yet, and they do not affect all sites, but still it is recommended hat you upgrade your sites to these latest versions as soon as possible (or otherwise ensure that these issues are not active in your site).
release notes:
http://docs.moodle.org/en/Moodle_1.9.5_release_notes
http://docs.moodle.org/en/Moodle_1.8.9_release_notes
