Prevent security role escalation #609
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This is a bugfix for a high security issue.
If you have a user that has admin rights to edit (other) users, the user could assign ANY group to other users. E.g. if you have a group with super admin permissions, the user could assign itself the user group go get full admin access.
With this hotfix, only super admin users can change user groups. A more advanced bugfix is coming the next days to partial restore group assignment.