Microsoft published the monthly security update program in April.2015（ Urgent 4 ，Important 7 ）.The vulnerablity this time might cause code execution from remote.

Please adapt automatic updatates etc refering to the related informatio in using the relevant program.
We recommend you to confirm it with manual update because there might be the case that you can't carry out the automatic updates.

Please refer to the following URL in manual update.
Windows Update user's guide

The Microsoft publishes the security update program as monthly batch on Second Tuesday every month(American local time). Japan publishes the security update program on Second or Third Wednesday every month because of the time difference.

■Related documents
Microsoft Corporation.
Microsoft Security Bulletin Summary for April 2015
Outline of Security Information in Microsoft as of April,2015

US-CERT
Microsoft Releases April 2015 Security Bulletin