Access denied when confirming additional email addresses

[fancycode]

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Steps to reproduce

1. Add enother email address in the profile.
2. Receive email that the new address must be confirmed.
3. Click link in the email.

Expected behaviour

The email should be confirmed. If this is not possible, the UI to add email addresses should be hidden for guest users.

Actual behaviour

"Der Zugriff auf diese Ressource ist für Gastnutzer untersagt." (Access denied for guest users).

Server configuration

Seen on c.n.c