CVE-2025-8995
📋 TL;DR
This vulnerability allows attackers to bypass authentication in Drupal sites using the Authenticator Login module by exploiting an alternate path or channel. It affects all Drupal installations running Authenticator Login module versions from initial release up to 2.1.4. Attackers could gain unauthorized access to protected areas without valid credentials.
💻 Affected Systems
- Drupal Authenticator Login module
📦 What is this software?
Authenticator Login by Authenticator Login Project
⚠️ Risk & Real-World Impact
Worst Case
Complete site compromise allowing attackers to access administrative functions, modify content, install malicious modules, and potentially pivot to other systems.
Likely Case
Unauthorized access to protected content areas, user data exposure, and privilege escalation for authenticated users.
If Mitigated
Limited impact if strong network segmentation, web application firewalls, and additional authentication layers are in place.
🎯 Exploit Status
CWE-288 indicates authentication bypass via alternate path/channel, suggesting relatively straightforward exploitation once details are known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1.4
Vendor Advisory: https://www.drupal.org/sa-contrib-2025-096
Restart Required: No
Instructions:
1. Log into Drupal admin panel. 2. Navigate to Extend > Update. 3. Update Authenticator Login module to version 2.1.4. 4. Clear Drupal cache via Configuration > Development > Performance > Clear all caches.
🔧 Temporary Workarounds
Disable Authenticator Login Module
allTemporarily disable the vulnerable module until patching is possible
drush pm-disable authenticator_login
Web Application Firewall Rule
allBlock suspicious authentication bypass attempts at the WAF layer
🧯 If You Can't Patch
- Implement IP-based access restrictions to admin/login paths
- Enable additional authentication factors for administrative users
🔍 How to Verify
Check if Vulnerable:
Check module version at /admin/modules or run: drush pm-list | grep authenticator_loginCheck Version:
drush pml --type=module --status=enabled --fields=name,version | grep authenticator_loginVerify Fix Applied:
Confirm module version shows 2.1.4 or higher📡 Detection & Monitoring
Log Indicators:
- Unusual authentication patterns
- Access to protected paths without prior login events
- Multiple failed login attempts followed by successful access
Network Indicators:
- HTTP requests to authentication endpoints with unusual parameters
- Traffic patterns suggesting authentication bypass
SIEM Query:
source="drupal_access.log" (status=200 OR status=302) AND (uri_path="/admin/*" OR uri_path="/user/*") AND NOT (user_agent contains "bot" OR user_agent contains "crawl") | stats count by src_ip, uri_path