Microsoft has released a non-scheduled security update for a critical vulnerability in the Internet Explorer (IE) browser.
It is recommended that you install this security patch immediately and then reboot your computer for the patch to take effect.
For office computers: The Microsoft security patch will automatically be pushed to all centrally managed Windows clients at the next scheduled interval.
Unmanaged systems: Should manually download and install the update via Microsoft Windows Updates.
Complete details can be found on McGill's Information Security website at http://www.mcgill.ca/infosec/news/.