Public bug reported:

The fix for CVE-2021-42097 requires that the user submitting a user
options form match the user in the CSRF token submitted with the form,
but the match is case sensitive and should not be.

There is also a potential NameError exception in logging a mismatch.

** Affects: mailman
     Importance: Medium
     Assignee: Mark Sapiro (msapiro)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1954694

Title:
  CSRF check for user tokens should not be case sensitive.

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