CVE-2025-57756
📋 TL;DR
This vulnerability in Contao CMS allows protected content elements to be indexed and publicly accessible through the front-end search functionality. Attackers can view content that should be restricted, leading to information disclosure. Organizations using affected Contao versions with protected content elements are at risk.
💻 Affected Systems
- Contao CMS
📦 What is this software?
Contao by Contao
Contao by Contao
Contao by Contao
Contao by Contao
⚠️ Risk & Real-World Impact
Worst Case
Sensitive protected content (user data, internal documents, confidential information) becomes publicly accessible to anyone using the search function, leading to data breach and regulatory violations.
Likely Case
Protected pages or content fragments that should only be visible to authenticated users become discoverable through public search results, exposing internal information.
If Mitigated
With proper access controls and monitoring, impact is limited to potential exposure of low-sensitivity protected content that shouldn't be public.
🎯 Exploit Status
Exploitation requires no authentication - simply using the search function on affected sites can reveal protected content.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.13.56, 5.3.38, or 5.6.1
Vendor Advisory: https://contao.org/en/security-advisories/information-disclosure-in-the-front-end-search-index
Restart Required: No
Instructions:
1. Backup your Contao installation and database. 2. Update Contao to version 4.13.56, 5.3.38, or 5.6.1 using Composer: 'composer update contao/core-bundle'. 3. Clear the cache: 'php vendor/bin/contao-console cache:clear'. 4. Verify the update completed successfully.
🔧 Temporary Workarounds
Disable Front-End Search
allTemporarily disable the search functionality to prevent indexing and access to protected content.
Navigate to Contao backend > System > Settings > Front end modules > Disable search module
🧯 If You Can't Patch
- Disable the front-end search module immediately to prevent exploitation
- Implement web application firewall rules to block search requests to protected content areas
🔍 How to Verify
Check if Vulnerable:
Check if your Contao version falls within affected ranges and if protected content elements exist that could be indexed by search.Check Version:
php vendor/bin/contao-console contao:versionVerify Fix Applied:
After patching, test that protected content elements are no longer appearing in search results when not authenticated.📡 Detection & Monitoring
Log Indicators:
- Unusual search query patterns accessing protected content URLs
- Increased search activity from unauthenticated users
Network Indicators:
- HTTP requests to search endpoints with parameters targeting protected content
SIEM Query:
web.access:*/search* AND (status:200 OR status:302) AND NOT user:authenticated