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.
Project Subscriptions
No advisories yet.
Solution
Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/#solution
Workaround
No workaround given by the vendor.
Mon, 19 Oct 2026 20:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Wso2 identity Server
|
|
| Vendors & Products |
Wso2 identity Server
|
Mon, 19 Oct 2026 17:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Username Enumeration via Authentication Endpoint in WSO2 Identity Server Allows User Account Discovery | |
| First Time appeared |
Wso2
Wso2 email Otp Authenticator Wso2 wso2 Carbon Abstract Otp Authenticator Wso2 wso2 Identity Server |
|
| Weaknesses | CWE-203 | |
| CPEs | cpe:2.3:a:wso2:email_otp_authenticator:*:*:*:*:*:*:*:* cpe:2.3:a:wso2:wso2_carbon_abstract_otp_authenticator:*:*:*:*:*:*:*:* cpe:2.3:a:wso2:wso2_identity_server:*:*:*:*:*:*:*:* |
|
| Vendors & Products |
Wso2
Wso2 email Otp Authenticator Wso2 wso2 Carbon Abstract Otp Authenticator Wso2 wso2 Identity Server |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: WSO2
Published:
Updated: 2026-10-19T16:45:59.519Z
Reserved: 2025-11-24T05:16:09.553Z
Link: CVE-2025-13591
No data.
Status : Awaiting Analysis
Published: 2026-10-19T17:16:59.413
Modified: 2026-10-19T21:06:28.507
Link: CVE-2025-13591
No data.
OpenCVE Enrichment
Updated: 2026-10-19T20:00:04Z