CVE Catalog

CVE-2025-5802

MediumCVSS 5.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.25%

17th percentile - higher than 17% of all known CVEs

Summary

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 allows an attacker to discover valid usernames within the system.

Risk Assessment

Risk of user enumeration, which can facilitate brute force, social engineering, and targeted phishing campaigns.

Recommendation

Change the error message to a neutral one, e.g., 'Registration failed', to avoid revealing username existence.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS