An attacker can access to "Forgot my password" button, as soon as he puts users is valid in the system, the system would issue a message that a password reset email had been sent to user. This way you can verify which users are in the system and which are not.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)
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