Editing User Property throws XSRF Security Token Missing, after trying to add a non-alphanumerical character as new User Property key.

Steps to reproduce:

1. Navigate to Administration > User Management > Users
2. Search for a user and view the user profile
3. Click the Actions button, and choose Edit Properties
4. Add new User Property if there is none. Ex. key = Color, value = Blue
5. Add another User Property, key = >, value = anything
   It will fail as expected
6. Click the Edit button to edit the existing User Property, and change it to any value

Expected result:
The value changed normally.

Actual result:
JIRA displayed XSRF Security Token Missing page. The value is changed afterwards.