By now, many of you might have come across the moment to realise that the mapped pages in SharePoint 2013, does not switch to the custom pages that you have created.
The mapped pages are as follows:
The new April CU for SharePoint 2013 seems to be the possible fix. The KB article point clearly mentions this in the issues that the CU fixes.
When you access some SharePoint Server 2013 resource that you do not have the permission for, you receive the OOB access denied page instead of the customer access denied page.