CVE-2025-13736: CWE-203: Information Disclosure Through Error Messages in WSO2 WSO2 Identity Server as Key Manager
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2025-13736) affects WSO2 Identity Server as Key Manager version 5.10.0. It arises from inconsistent masking of user existence during login when Multi-Attribute Login is enabled. Specifically, the login interface reveals valid usernames by returning the canonical username, while non-existent usernames are echoed as originally input. This information disclosure flaw is classified under CWE-203 (Information Exposure Through Discrepancy). The issue persists regardless of the validate_username configuration, potentially enabling attackers to enumerate valid user accounts.
Potential Impact
The vulnerability allows attackers to discover valid usernames through the login interface. This information disclosure can facilitate brute force attacks by focusing on known usernames, improve the effectiveness of social engineering and phishing campaigns, and increase the risk of targeted information leakage. The CVSS v3.1 base score is 3.7 (low severity), reflecting limited confidentiality impact and no integrity or availability impact.
Mitigation Recommendations
No official patch or remediation level has been published by the vendor as of now. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, organizations should consider disabling Multi-Attribute Login if feasible or implementing additional monitoring and rate limiting on login attempts to reduce the risk of username enumeration.
CVE-2025-13736: CWE-203: Information Disclosure Through Error Messages in WSO2 WSO2 Identity Server as Key Manager
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.
CVSS v3.1
Score 3.7low
Affected software
pkg:maven/org.wso2.identityserver/key-managerRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2025-13736) affects WSO2 Identity Server as Key Manager version 5.10.0. It arises from inconsistent masking of user existence during login when Multi-Attribute Login is enabled. Specifically, the login interface reveals valid usernames by returning the canonical username, while non-existent usernames are echoed as originally input. This information disclosure flaw is classified under CWE-203 (Information Exposure Through Discrepancy). The issue persists regardless of the validate_username configuration, potentially enabling attackers to enumerate valid user accounts.
Potential Impact
The vulnerability allows attackers to discover valid usernames through the login interface. This information disclosure can facilitate brute force attacks by focusing on known usernames, improve the effectiveness of social engineering and phishing campaigns, and increase the risk of targeted information leakage. The CVSS v3.1 base score is 3.7 (low severity), reflecting limited confidentiality impact and no integrity or availability impact.
Mitigation Recommendations
No official patch or remediation level has been published by the vendor as of now. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, organizations should consider disabling Multi-Attribute Login if feasible or implementing additional monitoring and rate limiting on login attempts to reduce the risk of username enumeration.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WSO2
- Date Reserved
- 2025-11-26T04:51:38.625Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7441c2bf8831d53967ebb5
Added to database: 08/06/2026, 08:11:46 UTC
Last enriched: 08/06/2026, 08:29:28 UTC
Last updated: 08/07/2026, 01:18:53 UTC
Views: 11
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