Username Enumeration via Authentication Endpoint in WSO2 Identity Server Allows User Account Discovery

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-13591
StatePUBLISHED
AssignerWSO2
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-19 17:16:59 UTC
Updated2026-10-19 21:06:28 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from ed10eef1-636d-4fbe-9993-6890dfa878f8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Problem Types: CWE-203 | CWE-203 CWE-203: Information Exposure Through Discrepancy

VersionSourceTypeScoreSeverityVector
3.1ed10eef1-636d-4fbe-9993-6890dfa878f8Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNACVSS5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA WSO2 WSO2 Identity Server unknown 7.0.0 custom Not specified
CNA WSO2 WSO2 Identity Server affected 7.0.0 7.0.0.134 custom Not specified
CNA WSO2 WSO2 Identity Server affected 7.1.0 7.1.0.42 custom Not specified
CNA WSO2 WSO2 Carbon Abstract OTP Authenticator affected 1.0.5 1.0.5.3 custom Not specified
CNA WSO2 WSO2 Carbon Abstract OTP Authenticator affected 1.0.10 1.0.10.2 custom Not specified
CNA WSO2 Email OTP Authenticator affected 1.0.18 1.0.18.8 custom Not specified
CNA WSO2 Email OTP Authenticator affected 1.0.30 1.0.30.5 custom Not specified

References

ReferenceSourceLinkTags
security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO... ed10eef1-636d-4fbe-9993-6890dfa878f8 security.docs.wso2.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/#solution

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