User enumeration in authentication mechanisms
Description
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The ability to enumerate users was possible without relevant permissions due to different exception messages depending on whether the user existed or not.
Resolution
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We now ensure that a generic message is returned whether the user exists or not if the password is invalid or if the user does not exist.
The patch for this issue is available here
https://github.com/lexik/LexikJWTAuthenticationBundle/commit/a175d6dab968d93e96a3e4f80c495435f71d5eb7 for branch 2.10.x and 2.x.
Credits
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I would like to thank James Isaac and Mathias Brodala for reporting the issue and Robin Chalas for fixing the issue.