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authentik/website/docs/security/CVE-2023-39522.md

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# CVE-2023-39522
_Reported by [@markrassamni](https://github.com/markrassamni)_
## Username enumeration attack
### Summary
Using a recovery flow with an identification stage an attacker is able to determine if a username exists.
### Patches
authentik 2023.5.6 and 2023.6.2 fix this issue.
### Impact
Only setups configured with a recovery flow are impacted by this.
### Details
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.
### For more information
If you have any questions or comments about this advisory:
- Email us at [security@goauthentik.io](mailto:security@goauthentik.io)