CVE-2026-27327
📋 TL;DR
This CVE describes a Missing Authorization vulnerability in the YayMail WooCommerce Email Customizer WordPress plugin that allows attackers to exploit incorrectly configured access control security levels. The vulnerability affects all versions up to and including 4.3.2, potentially allowing unauthorized access to sensitive functionality. WordPress sites using the vulnerable plugin are affected.
💻 Affected Systems
- YayMail - WooCommerce Email Customizer
⚠️ 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 email templates to include malicious content, steal customer data, or take full control of the WooCommerce store.
Likely Case
Unauthorized users could modify email templates, potentially inserting phishing links or malicious content that gets sent to customers, compromising customer trust and security.
If Mitigated
With proper access controls and authentication requirements, the vulnerability would be prevented, limiting access to authorized administrators only.
🎯 Exploit Status
The vulnerability involves missing authorization checks, which typically means attackers with some level of access can escalate privileges or access unauthorized functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.3.3 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find YayMail - WooCommerce Email Customizer. 4. Click 'Update Now' if update is available. 5. Alternatively, download version 4.3.3+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the YayMail plugin until patched to prevent exploitation
wp plugin deactivate yaymail
Access Restriction
allRestrict access to WordPress admin area using IP whitelisting or web application firewall rules
🧯 If You Can't Patch
- Implement strict access controls and monitor for unauthorized access attempts
- Disable the YayMail plugin and use alternative email customization solutions
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > YayMail version. If version is 4.3.2 or lower, you are vulnerable.Check Version:
wp plugin get yaymail --field=versionVerify Fix Applied:
Verify YayMail plugin version is 4.3.3 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to YayMail admin endpoints
- Unusual modifications to email templates
- Multiple failed authentication attempts followed by successful access
Network Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with yaymail-related actions
- Requests from unexpected IP addresses accessing admin functionality
SIEM Query:
source="wordpress" AND (uri_path="/wp-admin/admin-ajax.php" AND action CONTAINS "yaymail") AND user_role!="administrator"