CVE-2025-27130
📋 TL;DR
Welcart e-Commerce versions 2.11.6 and earlier contain an untrusted data deserialization vulnerability that allows remote unauthenticated attackers to execute arbitrary code. This affects any website built with the vulnerable Welcart plugin. Attackers can compromise the entire web server through this remote code execution vulnerability.
💻 Affected Systems
- Welcart e-Commerce
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise allowing attackers to install malware, steal sensitive data, pivot to internal networks, and maintain persistent access.
Likely Case
Website defacement, data theft, cryptocurrency mining malware installation, and backdoor deployment for future attacks.
If Mitigated
Limited impact if proper network segmentation, WAF rules, and monitoring are in place to detect and block exploitation attempts.
🎯 Exploit Status
Deserialization vulnerabilities are commonly weaponized. The CVSS score of 8.8 indicates high exploitability with low attack complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.11.7 or later
Vendor Advisory: https://www.welcart.com/archives/23868.html
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins. 3. Find Welcart e-Commerce plugin. 4. Click 'Update Now' if update available. 5. If manual update needed, download version 2.11.7+ from welcart.com, upload via FTP/SFTP to wp-content/plugins/ folder, overwriting old files.
🔧 Temporary Workarounds
WAF Rule Implementation
allDeploy Web Application Firewall rules to block deserialization attacks targeting Welcart endpoints.
ModSecurity rule: SecRule ARGS "@rx (?:O|C):\d+:" "id:1001,phase:2,deny,status:403,msg:'Possible PHP object injection'"
Cloudflare WAF: Create rule to block requests containing serialized PHP objects to Welcart paths
Disable Vulnerable Endpoints
allTemporarily block access to Welcart API endpoints until patched.
Apache: RewriteRule ^/wp-content/plugins/usc-e-shop/.*\.php$ - [F,L]
Nginx: location ~ ^/wp-content/plugins/usc-e-shop/.*\.php$ { deny all; }
🧯 If You Can't Patch
- Isolate the vulnerable server in a DMZ with strict network controls
- Implement application allowlisting to prevent execution of unauthorized processes
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Welcart e-Commerce version. If version is 2.11.6 or lower, system is vulnerable.Check Version:
grep -r "Version:" wp-content/plugins/usc-e-shop/usc-e-shop.php | cut -d':' -f2Verify Fix Applied:
Verify Welcart plugin version shows 2.11.7 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to Welcart plugin endpoints
- PHP errors containing 'unserialize' in error logs
- Unexpected process execution from web server user
Network Indicators:
- HTTP requests with serialized PHP objects in parameters
- Outbound connections from web server to suspicious IPs
SIEM Query:
source="web_logs" AND (uri_path="/wp-content/plugins/usc-e-shop/" OR user_agent="*Welcart*") AND (http_method="POST" AND size_bytes>1000)