CVE-2025-6729
📋 TL;DR
The PayMaster for WooCommerce WordPress plugin contains a Server-Side Request Forgery (SSRF) vulnerability that allows authenticated attackers with Subscriber-level access or higher to make arbitrary web requests from the vulnerable server. This can be used to query and modify information from internal services. All WordPress sites using this plugin up to version 0.4.31 are affected.
💻 Affected Systems
- PayMaster for WooCommerce WordPress plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal services, exfiltrate sensitive data, perform port scanning of internal networks, or chain with other vulnerabilities to achieve remote code execution.
Likely Case
Attackers will use this to probe internal networks, access metadata services, or interact with internal APIs to gather information for further attacks.
If Mitigated
With proper network segmentation and egress filtering, impact is limited to information disclosure from services the web server can reach.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once credentials are obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.4.32 or later
Vendor Advisory: https://wordpress.org/plugins/woocommerce-paymaster-gateway-019/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'PayMaster for WooCommerce'. 4. Click 'Update Now' if update is available. 5. Alternatively, download latest version from WordPress plugin repository and replace plugin files.
🔧 Temporary Workarounds
Disable vulnerable AJAX endpoint
allRemove or restrict access to the vulnerable wp_ajax_paym_status action
Add to theme's functions.php or custom plugin: remove_action('wp_ajax_paym_status', 'paym_status_callback'); remove_action('wp_ajax_nopriv_paym_status', 'paym_status_callback');
Restrict user registration
allTemporarily disable new user registration to prevent attacker account creation
In WordPress admin: Settings → General → uncheck 'Anyone can register'
🧯 If You Can't Patch
- Disable the PayMaster for WooCommerce plugin entirely
- Implement network egress filtering to restrict outbound connections from web servers
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for PayMaster for WooCommerce version. If version is 0.4.31 or lower, you are vulnerable.Check Version:
wp plugin list --name='woocommerce-paymaster-gateway-019' --field=version (if WP-CLI installed)Verify Fix Applied:
Verify plugin version is 0.4.32 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with action=paym_status parameter
- Outbound web requests from web server to internal IP ranges or unusual domains
Network Indicators:
- Web server making unexpected HTTP requests to internal services (169.254.169.254, 10.x, 172.16.x, 192.168.x)
SIEM Query:
source="web_logs" AND uri="/wp-admin/admin-ajax.php" AND params.action="paym_status"