CVE-2026-27202
📋 TL;DR
GetSimple CMS has a path traversal vulnerability in its Uploaded Files feature that allows attackers to read arbitrary files on the server. This affects all versions of GetSimple CMS and has not been patched. Any website using GetSimple CMS is vulnerable to this attack.
💻 Affected Systems
- GetSimple CMS
📦 What is this software?
Getsimple Cms by Getsimple Ce
⚠️ Risk & Real-World Impact
Worst Case
Attackers can read sensitive files like configuration files, database credentials, and system files, potentially leading to complete system compromise.
Likely Case
Attackers will read configuration files to extract database credentials and other sensitive information, then use that to escalate access.
If Mitigated
With proper file permissions and web server restrictions, attackers may only be able to read web-accessible files.
🎯 Exploit Status
The advisory includes technical details that make exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-xhwv-g6q4-h886
Restart Required: No
Instructions:
No official patch exists. Consider migrating to alternative CMS or implementing workarounds.
🔧 Temporary Workarounds
Disable Uploaded Files Feature
allRemove or disable the vulnerable Uploaded Files functionality
Remove or rename the uploads directory and related PHP files
Web Server Path Restriction
allConfigure web server to block path traversal attempts
Add rewrite rules to block ../ patterns in URLs
🧯 If You Can't Patch
- Implement strict file permissions (chmod 600 for sensitive files)
- Deploy WAF rules to block path traversal patterns
🔍 How to Verify
Check if Vulnerable:
Test if you can access files outside web root using the uploads feature with ../ patternsCheck Version:
Check GetSimple CMS version in admin panel or gsconfig.phpVerify Fix Applied:
Verify path traversal attempts return 403/404 errors instead of file contents📡 Detection & Monitoring
Log Indicators:
- Multiple requests with ../ patterns in URL parameters
- Access to sensitive files from uploads endpoint
Network Indicators:
- HTTP requests containing ../ patterns in GET parameters
SIEM Query:
web.url:*../* AND (web.url:*uploads* OR web.url:*admin*)