Reported by @markrassamni
Username enumeration attack
Using a recovery flow with an identification stage an attacker is able to determine if a username exists.
authentik 2023.5.6 and 2023.6.2 fix this issue.
Only setups configured with a recovery flow are impacted by this.
An attacker can easily enumerate and check users' existence using the recovery flow, as a clear message is shown when a user doesn't exist. Depending on configuration this can either be done by username, email, or both.
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