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CVE-2024-0391

Username Enumeration via Email OTP Flow in Multiple WSO2 Products Allows User Account Discovery

Published: May 11, 2026Updated: May 27, 2026 Sources: CVE List NVDCWE-204
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.2%
Top 91.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-204

Affected Products

WSO2 Identity ServerWSO2
SaaSSecurity Product
Security Products / identity-access-mgmt
WSO2 Open Banking IAMWSO2
On-prem
Cloud & SaaS / api-gateway
WSO2 Identity Server as Key ManagerWSO2
On-premSecurity Product
Cloud & SaaS
Email OTP AuthenticatorWSO2
On-prem
Cloud & SaaS / api-gateway
WSO2 Carbon Authenticator Library For EmailOTPWSO2
On-prem
Cloud & SaaS / api-gateway
wso2commercialINCloud & SaaS
and 3 more affected products View all →

Exploitability

Official Patch Available

References

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

Timeline

Published
May 11, 2026
Last Updated
May 27, 2026

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