CVE-2025-1396

Username Enumeration in Multiple WSO2 Products with Multi-Attribute Login Enabled

Published Sep 26, 2025 CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2025/WSO2-2025-3983/#solution https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2025/WSO2-2025-3983/#solution

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-31223 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.
Github GHSA Github GHSA GHSA-w82p-r9vw-4rg5 WSO2's Input Validation Management Service contains Observable Discrepancy when Multi-Attribute Login is enabled
History
Type Values Removed Values Added
CPEs cpe:2.3:a:wso2:identity_server:5.10.0:*:*:*:*:*:*:*
cpe:2.3:a:wso2:identity_server:5.11.0:*:*:*:*:*:*:*
cpe:2.3:a:wso2:identity_server:6.0.0:*:*:*:*:*:*:*
cpe:2.3:a:wso2:identity_server:6.1.0:*:*:*:*:*:*:*
cpe:2.3:a:wso2:identity_server_as_key_manager:5.10.0:*:*:*:*:*:*:*
cpe:2.3:a:wso2:open_banking_iam:2.0.0:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Wso2
Wso2 identity Server
Wso2 identity Server As Key Manager
Wso2 open Banking Iam
Vendors & Products Wso2
Wso2 identity Server
Wso2 identity Server As Key Manager
Wso2 open Banking Iam
Type Values Removed Values Added
Weaknesses CWE-203
Type Values Removed Values Added
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.
Title Username Enumeration in Multiple WSO2 Products with Multi-Attribute Login Enabled
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
WSO2
Published
Updated
Sep 30, 2025, 3:43 PM
Reserved
Feb 17, 2025, 2:17 PM
Status
Analyzed
Published
Sep 26, 2025, 8:15 AM
Modified
Oct 18, 2026, 9:10 PM