CVE-2025-13736
LowCVSS 3.7Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
When Multi-Attribute Login is enabled, the login interface fails to consistently mask the existence of user accounts. For valid users, the server resolves and displays their canonical username, while for non-existent users, it echoes the original input. This occurs regardless of the validate_username configuration. The discovery of valid usernames can increase the risk of brute force attacks, social engineering attacks, and targeted information leakage.
Risk Assessment
The risk includes the possibility of more effective phishing and social engineering attacks on user accounts, potentially leading to account compromise and sensitive data leakage.
Recommendation
It is recommended to configure the login interface to always return the same response for existing and non-existing users, and to enable mechanisms that limit login attempts (e.g., lockouts after failed attempts).
Original NVD description (English source)
When Multi-Attribute Login is enabled, the login interface fails to consistently mask the existence of user accounts. For valid users, the server resolves and displays their canonical username, while for non-existent users, it echoes the original input. This occurs regardless of the validate_username configuration. The discovery of valid usernames can increase the risk of brute force attacks, social engineering attacks, and targeted information leakage. Attackers can leverage this information to craft more effective phishing campaigns or social engineering tactics to compromise user accounts or extract sensitive data.