Multiple vulnerabilities were found in Microsoft Development Tools. Malicious users can exploit these vulnerabilities to obtain sensitive information, perform cross-site scripting attacks.
Team Foundation Server 2018 Updated 1.2
Team Foundation Server 2017 Update 3.1
Team Foundation Server 2018 Update 3.2
Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)