Microsoft has released a total of 16 security bulletins on this month's patch day. Patch day refers to the second Tuesday of each month on which Microsoft will release security patches. This month's patch day consists of many different patches. Nine of the 16 bulletins have a maximum severity rating of critical, the highest possible rating, the remaining 7 bulletins a rating of important.
Highest possible means that at least one operating system or application has received that rating. It happens that all programs receive the same rating, but it is often not the case.
When you look at affected software programs you will notice that the majority of bulletins resolve issues under Microsoft Windows. Other Microsoft software affected includes Microsoft Internet Explorer, Microsoft Office or the Microsoft .Net Framework.
Detailed bulletin information have not been released at this point. Windows users can however check for updates to download and install the security patches right away. This is done via Start Menu > All Programs > Windows Update.
I will update this guide as soon as more information become available.
Update: The June security bulletins have been posted.
You get an overview of all patches on the security bulletin summary page over at Microsoft. It lists for instance the individual severity level of all affected operating systems and applications. Patches do not seem to have been posted yet on Microsoft Download Center.
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