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.
References
| Link | Resource |
|---|---|
| https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2025/WSO2-2025-3983/ | Vendor Advisory |
Configurations
Configuration 1 (hide)
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History
18 Oct 2026, 21:10
| Type | Values Removed | Values Added |
|---|---|---|
| Summary |
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Information
Published : 2025-09-26 08:15
Updated : 2026-10-18 21:10
NVD link : CVE-2025-1396
Mitre link : CVE-2025-1396
CVE.ORG link : CVE-2025-1396
JSON object : View
Products Affected
wso2
- identity_server
- open_banking_iam
- identity_server_as_key_manager
CWE
CWE-203
Observable Discrepancy
