CVE-2025-13591: CWE-203: Information Exposure Through Discrepancy in WSO2 WSO2 Identity Server
Description
The authentication endpoint of WSO2 Identity Server fails to provide a consistent system response when a username does not exist in the system, allowing attackers to differentiate between valid and invalid usernames. This difference in responses can be leveraged to enumerate existing user accounts. Successful exploitation enables an attacker to discover valid usernames within the system, significantly increasing the risk of subsequent attacks such as brute force attacks on user credentials, social engineering attacks, and information leakage. The discovered usernames can be used to craft targeted phishing emails or other social engineering campaigns.
CVSS v3.1
Score 5.3medium
Affected software
WSO2
WSO2 Identity Server
WSO2
WSO2 Carbon Abstract OTP Authenticator
WSO2
Email OTP Authenticator
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WSO2
- Date Reserved
- 2025-11-24T05:16:09.553Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad64dbc2cdf04f656724f87
Added to database: 10/19/2026, 17:05:00 UTC
Last updated: 10/19/2026, 17:05:00 UTC
Views: 1
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