Severity Rating: Critical
Revision Note: V1.0 (October 13, 2015): Bulletin published.
Summary: This security update resolves vulnerabilities in the VBScript and JScript scripting engines in Microsoft Windows. The more severe of the vulnerabilities could allow remote code execution if an attacker hosts a specially crafted website that is designed to exploit the vulnerabilities through Internet Explorer (or leverages a compromised website or a website that accepts or hosts user-provided content or advertisements) and then convinces a user to view the website. An attacker could also embed an ActiveX control marked “safe for initialization” in an application or Microsoft Office document that uses the IE rendering engine to direct the user to the specially crafted website.

Severity Rating: Critical
Revision Note: V1.0 (October 13, 2015): Bulletin published.
Summary: This security update resolves vulnerabilities in Microsoft Windows. The vulnerabilities could allow remote code execution if a user opens a specially crafted toolbar object in Windows or an attacker convinces a user to view specially crafted content online.

Severity Rating: Important
Revision Note: V1.0 (October 13, 2015): Bulletin published.
Summary: This security update resolves vulnerabilities in Microsoft Edge. The most severe of the vulnerabilities could allow information disclosure if a user views a specially crafted webpage using Microsoft Edge. An attacker who successfully exploited these vulnerabilities could gain the same user rights as the current user. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.