CVE-2025-7393 is a critical security vulnerability identified in the Drupal Mail Login module, specifically versions from 3.0.0 before 3.2.0 and from 4.0.0 before 4.2.0. The vulnerability is classified under CWE-307, which pertains to the improper restriction of excessive authentication attempts. This flaw allows an attacker to perform brute force attacks against the authentication mechanism without effective rate limiting or lockout controls. Since the vulnerability does not require any privileges or user interaction (as indicated by the CVSS vector AV:N/AC:L/PR:N/UI:N), it can be exploited remotely over the network with low complexity. The impact is severe, as successful exploitation can lead to full compromise of user accounts, resulting in complete loss of confidentiality, integrity, and availability of the affected Drupal sites. The CVSS score of 9.8 (critical) reflects the high severity, with potential for attackers to gain unauthorized access, manipulate site content, or disrupt services. The lack of patch links suggests that at the time of this report, no official fixes have been released, increasing the urgency for mitigation. Although no known exploits are currently reported in the wild, the ease of exploitation and critical impact make this a high-risk vulnerability that requires immediate attention from administrators of affected Drupal Mail Login versions.

For European organizations using Drupal with the vulnerable Mail Login module, this vulnerability poses a significant risk. Many European public sector entities, educational institutions, and private companies rely on Drupal for content management and user authentication. Exploitation could lead to unauthorized access to sensitive data, defacement of websites, disruption of online services, and potential data breaches subject to GDPR regulations. The compromise of user accounts could also facilitate further lateral movement within organizational networks, increasing the risk of broader cyberattacks. Given the criticality and the fact that no authentication or user interaction is required, attackers can automate brute force attempts at scale, potentially affecting multiple organizations simultaneously. This could result in reputational damage, financial losses, and regulatory penalties for affected entities in Europe.

1. Immediate mitigation should include implementing external rate limiting and account lockout policies at the web server or application firewall level to prevent brute force attempts until official patches are available. 2. Monitor authentication logs closely for unusual login attempts or spikes in failed authentications. 3. Disable or restrict access to the Mail Login module if it is not essential for business operations. 4. Enforce strong password policies and encourage multi-factor authentication (MFA) for all user accounts to reduce the risk of credential compromise. 5. Regularly update Drupal core and contributed modules, and apply security patches promptly once released for this vulnerability. 6. Consider deploying web application firewalls (WAFs) with specific rules to detect and block brute force patterns targeting the Mail Login endpoint. 7. Conduct security awareness training for administrators and users about the risks of brute force attacks and the importance of secure credentials.