CVE-2025-9219
📋 TL;DR
This vulnerability allows authenticated WordPress users with Subscriber-level access or higher to enable premium extensions in the Post SMTP plugin without authorization. It affects all WordPress sites using Post SMTP plugin versions up to 3.4.1. The flaw stems from a missing capability check in the update_post_smtp_pro_option_callback function.
💻 Affected Systems
- Post SMTP - WP SMTP Plugin with Email Logs and Mobile App for Failure Notifications
⚠️ 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 enable paid features, potentially disrupting email functionality or gaining unauthorized access to premium features, leading to financial loss or service disruption.
Likely Case
Low-privileged users enable pro features they shouldn't have access to, potentially causing configuration issues or minor service disruptions.
If Mitigated
With proper user role management and monitoring, impact is minimal as it doesn't allow privilege escalation or data theft.
🎯 Exploit Status
Exploitation requires authenticated access but is technically simple once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.4.2 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3353624/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Post SMTP plugin. 4. Click 'Update Now' if available. 5. Alternatively, download latest version from WordPress repository and manually update.
🔧 Temporary Workarounds
Temporary plugin deactivation
allDisable the Post SMTP plugin until patched
User role restriction
allTemporarily restrict Subscriber role capabilities or remove unnecessary users
🧯 If You Can't Patch
- Implement strict user role management and review all user accounts with Subscriber or higher access
- Monitor plugin settings changes and audit logs for unauthorized modifications
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Post SMTP version. If version is 3.4.1 or lower, you are vulnerable.Check Version:
wp plugin list --name=post-smtp --field=versionVerify Fix Applied:
After updating, verify Post SMTP plugin version shows 3.4.2 or higher in WordPress plugins list.📡 Detection & Monitoring
Log Indicators:
- Unauthorized POST requests to admin-ajax.php with action=update_post_smtp_pro_option
- Unexpected changes to Post SMTP plugin settings or pro feature activation
Network Indicators:
- HTTP POST requests to /wp-admin/admin-ajax.php with suspicious parameters
SIEM Query:
source="wordpress.log" AND "admin-ajax.php" AND "update_post_smtp_pro_option"