CVE-2024-0391

Published May 11, 2026

Last updated 11 days ago

CVSS medium 5.3

Overview

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.
Source
ed10eef1-636d-4fbe-9993-6890dfa878f8
NVD status
Analyzed
Products
identity_server, identity_server_as_key_manager, open_banking_iam

Risk scores

CVSS 3.1

Type
Primary
Base score
4.3
Impact score
1.4
Exploitability score
2.8
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Severity
MEDIUM

Weaknesses

ed10eef1-636d-4fbe-9993-6890dfa878f8
CWE-204

Social media

Hype score
Not currently trending

  1. CVE-2024-0391 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 accoun… https://t.co/Ts7BObKQH3

    @CVEnew

    11 May 2026

    115 Impressions

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  2. CVE-2024-0391 User Account Enumeration via Email OTP Flow Input Validation Failure https://t.co/hTTSlyjWSQ

    @VulmonFeeds

    11 May 2026

    42 Impressions

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Configurations

Related CVEs

  1. Due to not validating the organization context when executing adaptive authentication flows, the WSO2 Identity Server allows adaptive authentication logic to be triggered on unintended organizations. A malicious actor with privileges to configure adaptive authentication within one organization can leverage this functionality to execute authentication logic on other organizations and sub-organizations. This flaw allows bypassing authorization boundaries between organizations, leading to unauthorized access to critical operations and user accounts in other organizations. When adaptive authentication is enabled in a multi-organization deployment, a malicious actor with privileges to configure adaptive authentication in one organization could exploit this feature to perform critical operations in other organizations without authorization. This may result in privilege escalation, unauthorized access to resources, and potential account takeover across organizations.•CVE-2025-9973
  2. The Magic Link authentication flow accepts multiple invalid authentication requests without adequate rate limiting or resource control, leading to uncontrolled memory usage growth. This vulnerability can result in a denial-of-service condition, causing service unavailability for deployments that utilize the Magic Link authenticator. The impact is limited to these specific deployments and requires repeated invalid authentication attempts to trigger.•CVE-2025-10470
  3. Due to a lack of user account state validation during authentication, locked user accounts can be successfully authenticated using Magic Link or Pass Key methods. This bypasses the intended security control that should prevent access to accounts that have been locked. This vulnerability may allow unauthorized access to applications and sensitive data associated with accounts that should have been restricted via the account lock mechanism. It also undermines the effectiveness of the account lock mechanism intended to prevent further login attempts.•CVE-2025-10908
  4. The authentication endpoint accepts user-supplied input without enforcing expected validation constraints, leading to a lack of proper output encoding. This allows for the injection of malicious JavaScript payloads, enabling reflected cross-site scripting. An attacker can leverage this vulnerability to redirect the user's browser to a malicious website, modify the user interface of the web page, retrieve information from the browser, or cause other harmful actions. However, due to the protection of session-related cookies with the httpOnly flag, session hijacking is not possible.•CVE-2025-10503
  5. Active access tokens are not revoked or invalidated when a user account is locked within WSO2 Identity Server. This failure to enforce revocation allows previously issued, valid tokens to remain usable, enabling continued access to protected resources by locked user accounts. The security consequence is that a locked user account can maintain access to protected resources through the use of existing, unexpired access tokens. This creates a security gap where access control policies are bypassed, potentially leading to unauthorized data access or actions until the tokens naturally expire.•CVE-2025-12624

References

Sources include official advisories and independent security research.