CVE-2024-0391: WSO2 Identity Server

Medium severity, CVSS 4.3. EPSS: 0.2% chance of exploitation in the next 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.

Affected products

• WSO2 Identity Server: from 5.10.0, before 5.10.0.379 (fixed in 5.10.0.379); from 5.11.0, before 5.11.0.426 (fixed in 5.11.0.426); from 6.0.0, before 6.0.0.253 (fixed in 6.0.0.253); from 6.1.0, before 6.1.0.254 (fixed in 6.1.0.254); from 7.0.0, before 7.0.0.131 (fixed in 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)

Published 2026-05-11. Last modified 2026-06-17.