CVE-2021-24835
📋 TL;DR
This SQL injection vulnerability in WCFM WordPress plugins allows low-privilege users (like Subscribers) to execute arbitrary SQL commands by manipulating the withdrawal_vendor parameter. It affects WordPress sites using WCFM - Frontend Manager for WooCommerce before version 6.5.12 in combination with other WCFM multivendor plugins. Attackers could potentially access, modify, or delete database content.
💻 Affected Systems
- WCFM - Frontend Manager for WooCommerce
- WCFM - WooCommerce Multivendor Marketplace
- WCFM - WooCommerce Multivendor plugins
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full database compromise leading to data theft, privilege escalation to administrator, or complete site takeover.
Likely Case
Data exfiltration of sensitive information like user credentials, payment details, or private business data.
If Mitigated
Limited impact if proper input validation and least privilege principles are enforced.
🎯 Exploit Status
Exploitation requires subscriber-level access. SQL injection is well-understood with many available tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.5.12
Vendor Advisory: https://wpscan.com/vulnerability/c493ac9c-67d1-48a9-be21-824b1a1d56c2
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find WCFM - Frontend Manager for WooCommerce. 4. Click 'Update Now' if available, or download version 6.5.12+ from WordPress repository. 5. Activate the updated plugin.
🔧 Temporary Workarounds
Temporary plugin deactivation
allDisable vulnerable WCFM plugins until patched
wp plugin deactivate wc-frontend-manager
Input validation via WAF
allBlock SQL injection patterns in withdrawal_vendor parameter
🧯 If You Can't Patch
- Restrict user registration and review existing subscriber accounts
- Implement network segmentation to isolate the WordPress instance
🔍 How to Verify
Check if Vulnerable:
Check plugin version in WordPress admin under Plugins → Installed Plugins for WCFM - Frontend Manager for WooCommerceCheck Version:
wp plugin get wc-frontend-manager --field=versionVerify Fix Applied:
Confirm version is 6.5.12 or higher and test SQL injection attempts are blocked📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts followed by withdrawal_vendor parameter manipulation
Network Indicators:
- HTTP POST requests with SQL injection patterns in withdrawal_vendor parameter
SIEM Query:
source="web_logs" AND (withdrawal_vendor CONTAINS "' OR" OR withdrawal_vendor CONTAINS "UNION SELECT" OR withdrawal_vendor CONTAINS "SQLI")