Medium 5.3Published May 11, 2026

CVE-2024-0391Username Enumeration via Email OTP Flow in Multiple WSO2 Products Allows User Account Discovery

Updated under an hour ago (Oct 27, 2026, 4:40 AM ET)

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It affects WSO2 Identity Server and 4 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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Every CVE for WSO2 Identity Server

Exploited in the last 30 days

The check user account lock states feature within the email OTP flow fails to validate user input, allowing an attacker to infer the existence of registered user accounts. The discovery of valid usernames can increase the risk of brute-force and social engineering attacks. Attackers can leverage this information to craft targeted phishing campaigns or other malicious activities aimed at tricking users into divulging sensitive data, potentially damaging the organization's reputation and leading to regulatory non-compliance and financial consequences.

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-204
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: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

WSO2 WSO2 Identity Server wso2:identity_server (from the name)	before 5.10.0 status unknown; from 5.10.0 before 5.10.0.379; from 5.11.0 before 5.11.0.426; from 5.11.0 before 5.11.0.431; from 6.0.0 before 6.0.0.253; from 6.1.0 before 6.1.0.254; from 7.0.0 before 7.0.0.131	CNA record
WSO2 WSO2 Open Banking IAM wso2:open_banking_iam (from the name)	before 2.0.0 status unknown; from 2.0.0 before 2.0.0.318	CNA record
WSO2 WSO2 Identity Server as Key Manager wso2:identity_server_as_key_manager (from the name)	before 5.10.0 status unknown; from 5.10.0 before 5.10.0.267	CNA record
WSO2 Email OTP Authenticator wso2:email_otp_authenticator (from the name)	from 1.0.18 before 1.0.18.7; from 1.0.24 not affected	CNA record
WSO2 WSO2 Carbon Authenticator Library For EmailOTP wso2:carbon_authenticator_library_for_emailotp (from the name)	from 4.1.0 before 4.1.0.8; from 4.1.4 before 4.1.4.9; from 4.1.22 not affected	CNA record
wso2 identity_server wso2:identity_server	from 5.10.0 before 5.10.0.379; from 5.11.0 before 5.11.0.426; from 6.0.0 before 6.0.0.253; from 6.1.0 before 6.1.0.254; from 7.0.0 before 7.0.0.131	NVD
wso2 identity_server_as_key_manager wso2:identity_server_as_key_manager	from 5.10.0 before 5.10.267	NVD
wso2 open_banking_iam wso2:open_banking_iam	from 2.0.0 before 2.0.0.318	NVD

References

References

https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2024-3115/	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.