Simple (silly?) question.
How do I check the version number of our webcenter portal application. We are on 11g but can I get a specific revision number somehow?
You have two choices:
Have a look into this Oracle Support Article which explains how to do it: How to Get the WebCenter Spaces/Portal Version and List of Installed Patches? (Doc ID 1053606.1)
Also check the table in: Installing WebCenter Portal Extensions in Oracle JDeveloper (Doc ID 1627574.1)