Description
The authentication endpoint of WSO2 Identity Server fails to provide a consistent system response when a username does not exist in the system, allowing attackers to differentiate between valid and invalid usernames. This difference in responses can be leveraged to enumerate existing user accounts. Successful exploitation enables an attacker to discover valid usernames within the system, significantly increasing the risk of subsequent attacks such as brute force attacks on user credentials, social engineering attacks, and information leakage. The discovered usernames can be used to craft targeted phishing emails or other social engineering campaigns.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
WSO2 WSO2 Identity Server
Default version status: unaffected
0 to < 7.0.0unknown7.0.0 to < 7.0.0.134affected7.1.0 to < 7.1.0.42affected
WSO2 WSO2 Carbon Abstract OTP Authenticator
Default version status: unknown
1.0.5 to < 1.0.5.3affected1.0.10 to < 1.0.10.2affected
WSO2 Email OTP Authenticator
Default version status: unknown
1.0.18 to < 1.0.18.8affected1.0.30 to < 1.0.30.5affected