CVE-2025-13591Username Enumeration via Authentication Endpoint in WSO2 Identity Server Allows User Account Discovery
Updated under an hour ago ()
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It affects WSO2 Identity Server and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-203
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- WSO2
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 20, 2026
- First seen by InfoSec Signals
- Oct 19, 2026
Affected products
WSO2 WSO2 Identity Server wso2:identity_server (from the name) | before 7.0.0 status unknown; from 7.0.0 before 7.0.0.134; from 7.1.0 before 7.1.0.42 | CNA record |
WSO2 WSO2 Carbon Abstract OTP Authenticator wso2:carbon_abstract_otp_authenticator (from the name) | from 1.0.5 before 1.0.5.3; from 1.0.10 before 1.0.10.2 | CNA record |
WSO2 Email OTP Authenticator wso2:email_otp_authenticator (from the name) | from 1.0.18 before 1.0.18.8; from 1.0.30 before 1.0.30.5 | CNA record |
References
- https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.