Moodle HQ have just announced an important security update, that is contained in maintenance release 1.9.7.

More information about it can be found here:

http://docs.moodle.org/en/Moodle_1.9.7_release_notes

And here:

http://docs.moodle.org/en/report/security/report_security_check_passwordsaltmain

If you are one of our customers then we will be updating your sites shortly. If you have a particular requirement to only have your sites updated on a certain day or at a certain time, please contact us to arrange this.