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# Which Problems Are Solved
User enumeration was possible on the select account page by passing any userID as part of the form POST. Existing users could be selected even if they never authenticated on the same user agent (browser).
# How the Problems Are Solved
A check for an existing session on the same user agent was added to the select user function, resp. only required for the account selection page, since in other cases there doesn't have to be an existing session and the user agent integrity is already checked.
# Additional Changes
None
# Additional Context
None
(cherry picked from commit 7abe759c95)