CVE-2025-7393 in Mail Login
Summary
by MITRE • 07/21/2025
Improper Restriction of Excessive Authentication Attempts vulnerability in Drupal Mail Login allows Brute Force.This issue affects Mail Login: from 3.0.0 before 3.2.0, from 4.0.0 before 4.2.0.
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Analysis
by VulDB Data Team • 08/27/2025
The CVE-2025-7393 vulnerability represents a critical weakness in the Drupal Mail Login module that directly enables brute force authentication attacks. This flaw stems from inadequate protection mechanisms against excessive authentication attempts, creating a significant security risk for Drupal installations using this module. The vulnerability specifically impacts versions 3.0.0 through 3.1.9 and 4.0.0 through 4.1.9, where the module fails to implement proper rate limiting or account lockout mechanisms during authentication processes. The issue allows malicious actors to systematically test numerous username and password combinations without triggering protective measures, making it particularly dangerous for environments with weak credential policies or exposed login endpoints.
From a technical perspective, the vulnerability manifests as a failure to enforce authentication attempt restrictions that would normally prevent automated attack vectors from exhausting login possibilities. The Mail Login module, which typically handles email-based authentication workflows, lacks the necessary controls to detect and mitigate repetitive authentication attempts. This weakness creates an environment where attackers can exploit the system through automated scripts or tools designed for credential brute forcing, potentially leading to account takeovers, unauthorized access to sensitive data, or further exploitation of the compromised system. The vulnerability operates at the application layer and directly impacts the authentication security controls that should normally protect against such attacks.
The operational impact of this vulnerability extends beyond simple credential compromise, as it can facilitate broader security breaches within Drupal environments. Attackers leveraging this weakness can systematically target user accounts, potentially leading to data exfiltration, privilege escalation, or establishment of persistent access points within the organization's infrastructure. The vulnerability particularly affects environments where email-based authentication is heavily relied upon, as the attack surface expands to include all email accounts that might be used for login purposes. Organizations using vulnerable versions of the Mail Login module face increased risk of successful credential stuffing attacks, especially when combined with publicly available username lists or previous breach data.
Security mitigation strategies for CVE-2025-7393 should prioritize immediate version upgrades to 3.2.0 or 4.2.0, where the authentication restriction mechanisms have been properly implemented. Organizations should also consider implementing additional protective measures such as IP address rate limiting, account lockout policies, and multi-factor authentication to reduce the effectiveness of brute force attacks. The vulnerability aligns with CWE-307 which addresses improper restriction of excessive authentication attempts, and maps to ATT&CK technique T1110 which covers brute force attacks. Network-level protections including firewalls, intrusion detection systems, and monitoring solutions should be enhanced to detect unusual authentication patterns and alert administrators to potential exploitation attempts. Regular security assessments and vulnerability scanning should include verification of module versions to prevent similar issues from persisting across the organization's Drupal deployments.