Issue Summary

Visiting the <confluence-url>/pages/editpage.action?pageId=<pageId> leads to below errors

Your request could not be processed because a required security token was not present in the request. You may need to re-submit the form or reload the page. 

This is reproducible on Data Center: (yes) 

Steps to Reproduce

1. Install Confluence 8.9.1
2. Create a Page
3. Identify the Page ID
4. Perform Edit page operation using "<confluence-url>/pages/editpage.action?pageId=<pageId>"

Expected Results

Page editor should get open

Actual Results

Below error encountered

Your request could not be processed because a required security token was not present in the request. You may need to re-submit the form or reload the page.

No error in the log files

Below error in the HAR file

Workaround

Edit the Page using the Edit button on the Page