CVE-2025-66128
📋 TL;DR
This CVE describes a Missing Authorization vulnerability in the Brevo Sendinblue for WooCommerce plugin that allows attackers to exploit incorrectly configured access control security levels. It affects WordPress sites using the Sendinblue for WooCommerce plugin for newsletter subscription functionality. Attackers could potentially manipulate access controls to perform unauthorized actions.
💻 Affected Systems
- Brevo Sendinblue for WooCommerce (woocommerce-sendinblue-newsletter-subscription)
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could gain administrative privileges, modify user data, access sensitive customer information, or disrupt newsletter subscription functionality.
Likely Case
Unauthorized users could modify newsletter subscription settings, access subscriber lists, or manipulate plugin configurations without proper authorization.
If Mitigated
With proper access controls and authentication mechanisms in place, only authorized administrators can manage plugin settings and subscriber data.
🎯 Exploit Status
Exploitation requires some level of access to the WordPress site, but the vulnerability lowers the required privilege level for certain actions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.0.50 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Sendinblue for WooCommerce'. 4. Click 'Update Now' if available. 5. Alternatively, download version 4.0.50+ from WordPress.org and manually update.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the vulnerable plugin until patched version can be installed
wp plugin deactivate woocommerce-sendinblue-newsletter-subscription
Access Restriction via .htaccess
linuxRestrict access to plugin directories if using Apache
<FilesMatch "\.(php|inc)$">
Order Deny,Allow
Deny from all
</FilesMatch>
🧯 If You Can't Patch
- Implement strict role-based access control (RBAC) in WordPress to limit who can access plugin settings
- Monitor WordPress audit logs for unauthorized access attempts to Sendinblue plugin functionality
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for 'Sendinblue for WooCommerce' version 4.0.49 or earlierCheck Version:
wp plugin get woocommerce-sendinblue-newsletter-subscription --field=versionVerify Fix Applied:
Verify plugin version is 4.0.50 or later in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to Sendinblue plugin endpoints
- Unexpected modifications to newsletter subscription settings
- User privilege escalation attempts
Network Indicators:
- Unusual API calls to Sendinblue/plugin endpoints from unauthorized IPs
SIEM Query:
source="wordpress" AND (plugin="sendinblue" OR plugin="woocommerce-sendinblue") AND (action="edit" OR action="update" OR action="modify") AND user_role!="administrator"