This patch addresses CVE-2019-18935 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18935 in Geocortex Essentials versions 4.0 through 4.8.2.

1. Overwrite C:\Program Files (x86)\Latitude Geographics\Geocortex Essentials\<instance>\REST Elements\Manager\bin\Telerik.Web.UI.dll with the Telerik.Web.UI.dll file included in this patch.
2. Open C:\Program Files (x86)\Latitude Geographics\Geocortex Essentials\<instance>\REST Elements\Manager\Web.config in a text editor.
3. Add the following app setting to the <appSettings> element
    <add key="Telerik.Web.DisableAsyncUploadHandler" value="true" />
	
Note: If a machine has multiple instances of Essentials you need to patch each instance separately.