CVE-2025-31681
📋 TL;DR
This CVE describes a Missing Authorization vulnerability in Drupal's Authenticator Login module that allows attackers to bypass authentication controls through forceful browsing. Attackers can access restricted functionality without proper credentials. This affects all Drupal sites using the Authenticator Login module.
💻 Affected Systems
- Drupal Authenticator Login module
📦 What is this software?
Authenticator Login by Authenticator Login Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to gain administrative access, modify content, install malicious modules, and potentially execute arbitrary code on the server.
Likely Case
Unauthorized access to protected administrative functions, content manipulation, user data exposure, and privilege escalation within the Drupal application.
If Mitigated
Limited impact with proper network segmentation, strong authentication controls, and monitoring in place, though the vulnerability still exists.
🎯 Exploit Status
Forceful browsing attacks typically require minimal technical skill and can be performed with standard web browsers or simple scripts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.6
Vendor Advisory: https://www.drupal.org/sa-contrib-2025-009
Restart Required: No
Instructions:
1. Log into Drupal admin panel. 2. Navigate to Extend > Update. 3. Check for available updates. 4. Update Authenticator Login module to version 2.0.6. 5. Clear Drupal cache.
🔧 Temporary Workarounds
Disable Authenticator Login Module
linuxTemporarily disable the vulnerable module until patching is possible
drush pm-disable authenticator_login
Implement Access Controls
allAdd additional authentication checks at web server or application firewall level
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to trusted IP addresses only
- Enable detailed logging and monitoring for unauthorized access attempts to protected paths
🔍 How to Verify
Check if Vulnerable:
Check Drupal admin panel at /admin/modules or run: drush pm-list | grep authenticator_loginCheck Version:
drush pm-list --fields=name,version | grep authenticator_loginVerify Fix Applied:
Verify module version shows 2.0.6 or higher in Drupal admin or via: drush pm-list --fields=name,version | grep authenticator_login📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to admin paths
- Multiple failed login attempts followed by successful access without credentials
- Access to /admin/* paths from unexpected IP addresses
Network Indicators:
- HTTP requests to protected admin endpoints without proper authentication headers
- Unusual patterns of direct URL access attempts
SIEM Query:
source="drupal_access_log" AND (uri_path="/admin/*" OR uri_path="/user/*") AND status=200 AND NOT (user_agent CONTAINS "admin" OR referrer CONTAINS "login")