CVE-2026-4393: Drupal Automated Logout CSRF Vulnerability

CVE-2026-4393 Overview

A Cross-Site Request Forgery (CSRF) vulnerability has been identified in the Drupal Automated Logout module. This security flaw allows attackers to trick authenticated users into performing unintended actions on their behalf without proper validation. The vulnerability affects multiple versions of the Automated Logout module, potentially enabling unauthorized modification of user session settings and logout configurations.

Critical Impact

Attackers can exploit this CSRF vulnerability to manipulate authenticated user sessions, potentially forcing logout configurations changes or other unauthorized actions within the Drupal CMS environment.

Affected Products

• Drupal Automated Logout module versions from 0.0.0 before 1.7.0
• Drupal Automated Logout module versions from 2.0.0 before 2.0.2

Discovery Timeline

• 2026-03-26 - CVE CVE-2026-4393 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-4393

Vulnerability Analysis

This Cross-Site Request Forgery (CSRF) vulnerability (CWE-352) exists in the Drupal Automated Logout module, which is designed to automatically log out users after a configurable period of inactivity. The vulnerability stems from insufficient validation of request origins when processing administrative or user-configurable actions within the module.

CSRF vulnerabilities occur when an application fails to properly verify that requests are intentionally made by the authenticated user. In this case, the Automated Logout module does not adequately implement anti-CSRF tokens or other request validation mechanisms, allowing malicious actors to craft requests that execute actions on behalf of logged-in users.

Root Cause

The root cause of this vulnerability is the absence or improper implementation of CSRF token validation in the Drupal Automated Logout module. When handling requests that modify session timeout settings or other module configurations, the application fails to verify that the request originated from a legitimate user session with proper authorization tokens.

Attack Vector

An attacker can exploit this vulnerability by crafting a malicious web page or email containing a hidden form or JavaScript code that submits requests to the vulnerable Drupal application. When an authenticated user with appropriate privileges visits the attacker-controlled page, the malicious request is automatically sent to the Drupal site using the victim's authenticated session.

The attack typically involves embedding requests within invisible iframes, auto-submitting forms, or AJAX requests that target the Automated Logout module endpoints. Since the victim's browser automatically includes session cookies with the request, the Drupal application processes it as if it were a legitimate user action.

For detailed technical information, refer to the Drupal Security Advisory.

Detection Methods for CVE-2026-4393

Indicators of Compromise

• Unexpected changes to Automated Logout module configuration settings
• Web server logs showing POST requests to Automated Logout endpoints originating from external referrers
• Anomalous session timeout behavior reported by authenticated users
• Access logs indicating requests with missing or invalid CSRF tokens

Detection Strategies

• Monitor Drupal watchdog logs for configuration changes to the Automated Logout module that were not authorized by administrators
• Implement web application firewall (WAF) rules to detect and block requests with suspicious referrer headers targeting CSRF-prone endpoints
• Review server access logs for POST requests to module administrative pages from untrusted external domains

Monitoring Recommendations

• Enable detailed Drupal logging to capture all configuration changes and their originating sessions
• Deploy network-level monitoring to identify cross-origin requests targeting authenticated Drupal sessions
• Implement SentinelOne Singularity XDR for endpoint visibility to detect malicious browser activity associated with CSRF exploitation

How to Mitigate CVE-2026-4393

Immediate Actions Required

• Upgrade Drupal Automated Logout module to version 1.7.0 or later for the 1.x branch
• Upgrade Drupal Automated Logout module to version 2.0.2 or later for the 2.x branch
• Review module configuration for any unauthorized changes that may have been made prior to patching
• Audit user session logs for any suspicious activity related to the Automated Logout functionality

Patch Information

The Drupal security team has released patched versions addressing this CSRF vulnerability. Organizations using the Automated Logout module should update to the following versions:

• 1.x branch: Upgrade to version 1.7.0 or later
• 2.x branch: Upgrade to version 2.0.2 or later

For complete patch details and download links, consult the Drupal Security Advisory.

Workarounds

• Temporarily disable the Automated Logout module if immediate patching is not possible
• Implement additional WAF rules to validate referrer headers and block cross-origin POST requests to the affected endpoints
• Restrict administrative access to the module configuration pages to trusted IP addresses only
• Educate administrators to avoid clicking untrusted links while authenticated to the Drupal site

# Disable the module via Drush if patching cannot be performed immediately
drush pm-uninstall autologout

# After upgrading, clear Drupal caches
drush cache-rebuild