CVE-2025-5802
MEDIUM
NVD
CVSS Score
5.3
Severity
MEDIUM
Published
Sep 15, 2026
Vendor
unknown
Description
The self-registration flow accepts user-supplied input for usernames without adequately preventing the disclosure of username existence. When a user attempts to register with an existing username, the system responds with an error message that explicitly indicates the username is already in use. This behavior allows an attacker to discover valid usernames within the system. The discovery of valid usernames can facilitate subsequent attacks such as brute force, social engineering, and targeted phishing campaigns.