Tfs-update_4a-pc.zip -

TFS 2015 Update 4 has been a stable "long-tail" version for many enterprises. However, older software is a prime target for vulnerabilities. Microsoft has released several patches—often referred to in documentation as or Update 4.2 —specifically to fix:

Check the official Microsoft DevOps Blog for the latest patch notes and security advisories. Team Foundation Server 2015 Update 4 Release Notes TFS-Update_4a-pc.zip

Typically, these patches include a tfs2015.4.xpatch.exe . Run this on your Application Tier. TFS 2015 Update 4 has been a stable

Check your Microsoft.TeamFoundation.Framework.Server.dll version in the Application Tier\Web Services\bin folder to confirm your current patch level. Team Foundation Server 2015 Update 4 Release Notes

Use the command line with the /CheckInstall flag (if available) or verify the file version in your installation directory to ensure the patch was applied correctly. The Path Forward: Time to Upgrade?

Preventing malicious scripts from being injected into your web portal.

Before you unzip TFS-Update_4a-pc.zip and run the installer, ensure you have completed these steps: