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Symptoms

The Lync Server 2010 Web App page sends the User-Agent string of the web browser that makes a request. Because the string is not encoded in the output, it can be used maliciously to inject script into the webpage. 

Resolution

To fix this issue, install the April 2016 cumulative update 4.0.7577.728 for Lync Server 2010, Web Components Server.

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