Overview
In this blog post, we will be discussing an important issue that has emerged in the cybersecurity landscape. Specifically, we’ll be focusing on CVE-2025-7393, a critical vulnerability in Drupal Mail Login, affecting versions from 3.0.0 before 3.2.0 and from 4.0.0 before 4.2.0. This vulnerability presents a substantial threat to the security of user data and system integrity, especially in environments where Drupal is prevalent. This vulnerability is significant due to its high CVSS score and the potential for system compromise or data leakage, therefore it is critical for users and administrators to take action to mitigate the risks.
Vulnerability Summary
CVE ID: CVE-2025-7393
Severity: Critical, CVSS Score 9.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, data leakage
Affected Products
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Product | Affected Versions
Drupal Mail Login | 3.0.0 – 3.1.9
Drupal Mail Login | 4.0.0 – 4.1.9
How the Exploit Works
At its root, CVE-2025-7393 is a vulnerability that stems from an improper restriction of excessive authentication attempts in Drupal Mail Login. This allows attackers to conduct a brute force attack by systematically attempting all possible passwords until the correct one is found. Since the system doesn’t lock out users after a certain number of failed login attempts, an attacker can continue guessing passwords indefinitely. This can lead to unauthorized access, data leakage, or even a complete system compromise.
Conceptual Example Code
Here’s a conceptual example of a brute force attack exploiting this vulnerability:
POST /user/login HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
username=admin&password=guess1
POST /user/login HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
username=admin&password=guess2
...This example illustrates multiple login attempts by an attacker, systematically changing the password parameter until the correct one is found.
Mitigation Guidance
In response to this vulnerability, the vendor has issued a patch. Users are strongly advised to update their Drupal Mail Login to the latest version (3.2.0 for the 3.x branch and 4.2.0 for the 4.x branch). In cases where immediate patching is not possible, deploying a web application firewall (WAF) or intrusion detection system (IDS) as a temporary mitigation measure can help protect against brute force attacks. However, these are only temporary solutions and updating the software is the most effective way to eliminate the vulnerability.