Severity Rating: Important Revision Note: V2.3 (August 11, 2016): Revised bulletin to announce a detection change to correct an offering issue for 3135996. This is a detection change only. There were no changes to the update files. Customers who have already successfully installed the update do not need to take any action. Summary: This security update resolves a vulnerability in Microsoft .NET Framework. The security feature bypass exists in a .NET Framework component that does not properly validate certain elements of a signed XML document.