Description
A username enumeration vulnerability exists in multiple WSO2 products when Multi-Attribute Login is enabled. In this configuration, the system returns a distinct "User does not exist" error message to the login form, regardless of the validate_username setting. This behavior allows malicious actors to determine which usernames exist in the system based on observable discrepancies in the application's responses. Exploitation of this vulnerability could aid in brute-force attacks, targeted phishing campaigns, or other social engineering techniques by confirming the validity of user identifiers within the system.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected products
- WSO2 / WSO2 Identity Server6.0.0 – 6.0.0.231
- WSO2 / WSO2 Identity Server5.10.0 – 5.10.0.346
- WSO2 / WSO2 Identity Server5.11.0 – 5.11.0.395
- WSO2 / WSO2 Identity Server0 – 5.10.0
- WSO2 / WSO2 Identity Server6.1.0 – 6.1.0.223
- WSO2 / WSO2 Identity Server as Key Manager5.10.0 – 5.10.0.339
- WSO2 / WSO2 Open Banking IAM2.0.0 – 2.0.0.390