What’s Vulnerable › Vulnerabilities
CVE-2024-0391: Username Enumeration via Email OTP Flow in Multiple WSO2 Products Allows User Account Discovery
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-11 · updated 2026-06-17
- Weakness: CWE-204
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.
Affected products
- 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 — fixed in 5.10.0.379, 5.11.0.426, 6.0.0.253, 6.1.0.254, 7.0.0.131
- WSO2 Identity Server As Key Manager: from 5.10.0 before 5.10.267 — fixed in 5.10.267
- WSO2 Open Banking Iam: from 2.0.0 before 2.0.0.318 — fixed in 2.0.0.318
How to fix
Upgrade to a fixed version: WSO2 Identity Server 5.10.0.379, 5.11.0.426, 6.0.0.253, 6.1.0.254; WSO2 Identity Server As Key Manager 5.10.267; WSO2 Open Banking Iam 2.0.0.318. Check the vendor advisory for mitigations.
References
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