Oracle has now certified IE11 (Internet Explorer 11) for WebCenter Portal 11.1.1.7.x and 11.1.1.8.x. You need to implement patch up to 11.1.1.8 with the latest Bundle Patch – kindly refer to Note 1087226.1
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Error the end users will see, in IE11 (within a popup):
You are using an unsupported browser. The supported browsers are Internet Explorer 7 and higher, Firefox 2.0.0.2 and higher, Safari 3.1.2 and higher, and Google Chrome 1.0 or higher.
Example of the popup screen:
Unsupported Browser
In summary, there are a number of differences between Microsoft IE 11 and former versions, where one that makes more difference is the change of the User-Agent header string