Severity Rating: Critical - Revision Note: V2.0 (August 12, 2008): Added known issues link. Also added an entry to the section, Frequently Asked Questions (FAQ) Related to this Security Update, about the known issues and solutions. The solutions include a deployment change for this security update for one issue and a workaround for another. Customers who have successfully updated their systems do not need to reinstall this update. Summary: This critical security update resolves a privately reported vulnerability in the VBScript and JScript scripting engines in Windows. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.