Description
When Multi-Attribute Login is enabled, the login interface fails to consistently mask the existence of user accounts. For valid users, the server resolves and displays their canonical username, while for non-existent users, it echoes the original input. This occurs regardless of the validate_username configuration.

The discovery of valid usernames can increase the risk of brute force attacks, social engineering attacks, and targeted information leakage. Attackers can leverage this information to craft more effective phishing campaigns or social engineering tactics to compromise user accounts or extract sensitive data.
Published: 2026-08-06
Score: 3.7 Low
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4013/#solution

Tracking

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Advisories

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History

Thu, 06 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Thu, 06 Aug 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Wso2
Wso2 wso2 Api Manager
Wso2 wso2 Identity Server
Wso2 wso2 Identity Server As Key Manager
Wso2 wso2 Open Banking Am
Wso2 wso2 Open Banking Iam
Vendors & Products Wso2
Wso2 wso2 Api Manager
Wso2 wso2 Identity Server
Wso2 wso2 Identity Server As Key Manager
Wso2 wso2 Open Banking Am
Wso2 wso2 Open Banking Iam

Thu, 06 Aug 2026 08:15:00 +0000

Type Values Removed Values Added
Description When Multi-Attribute Login is enabled, the login interface fails to consistently mask the existence of user accounts. For valid users, the server resolves and displays their canonical username, while for non-existent users, it echoes the original input. This occurs regardless of the validate_username configuration. The discovery of valid usernames can increase the risk of brute force attacks, social engineering attacks, and targeted information leakage. Attackers can leverage this information to craft more effective phishing campaigns or social engineering tactics to compromise user accounts or extract sensitive data.
Title Username Enumeration via Login Interface in Multiple WSO2 Products Allows User Account Discovery
Weaknesses CWE-203
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'}


Subscriptions

Wso2 Wso2 Api Manager Wso2 Identity Server Wso2 Identity Server As Key Manager Wso2 Open Banking Am Wso2 Open Banking Iam
cve-icon MITRE

Status: PUBLISHED

Assigner: WSO2

Published:

Updated: 2026-08-06T12:35:37.283Z

Reserved: 2025-11-26T04:51:38.625Z

Link: CVE-2025-13736

cve-icon Vulnrichment

Updated: 2026-08-06T12:35:34.558Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-06T10:45:03Z

Weaknesses