These vulnerabilities can be exploited by malicious people to conduct cross-site scripting and spoofing attacks, disclose potentially sensitive information, bypass certain security restrictions, and compromise a user's system.
Microsoft Security Bulletin Advance Notification for June 2013. Microsoft has posted 1 Critical Bulletin and 4 Important Bulletins. Bulletins with the Maximum Severity Rating and Vulnerability Impact of "Critical" June allow remote execution of code. Microsoft will host a webcast to address customer questions on the security bulletins on June 12, 2013, at 11:00 AM Pacific Time (US & Canada).