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.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected products
- wso2 / Email OTP Authenticator1.0.18 – 1.0.18.8
- wso2 / Email OTP Authenticator1.0.30 – 1.0.30.5
- wso2 / WSO2 Carbon Abstract OTP Authenticator1.0.5 – 1.0.5.3
- wso2 / WSO2 Carbon Abstract OTP Authenticator1.0.10 – 1.0.10.2
- wso2 / WSO2 Identity Server7.0.0 – 7.0.0.134
- wso2 / WSO2 Identity Server7.1.0 – 7.1.0.42
- wso2 / WSO2 Identity Server0 – 7.0.0
Updated 40m ago · 8 sources