CVE-2023-3179
📋 TL;DR
This CSRF vulnerability in the POST SMTP Mailer WordPress plugin allows attackers to trick authenticated administrators into resending emails to attacker-controlled addresses. Attackers could exploit this to intercept password reset emails and potentially take over accounts. WordPress sites using vulnerable plugin versions are affected.
💻 Affected Systems
- POST SMTP Mailer WordPress plugin
📦 What is this software?
Post Smtp by Wpexperts
⚠️ Risk & Real-World Impact
Worst Case
Account takeover through intercepted password reset emails, leading to complete site compromise and potential data breach.
Likely Case
Unauthorized email redirection allowing attackers to reset passwords and gain access to user accounts.
If Mitigated
Limited impact with proper CSRF protections and email verification mechanisms in place.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated users into clicking malicious links.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.5.7
Vendor Advisory: https://wpscan.com/vulnerability/542caa40-b199-4397-90bb-4fdb693ebb24
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find POST SMTP Mailer and update to version 2.5.7 or later. 4. Verify update completes successfully.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the vulnerable plugin until patching is possible
wp plugin deactivate post-smtp
CSRF Protection Implementation
allAdd CSRF tokens to AJAX requests via custom code
🧯 If You Can't Patch
- Restrict plugin access to trusted administrators only
- Implement web application firewall rules to block suspicious AJAX requests
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → POST SMTP Mailer version numberCheck Version:
wp plugin get post-smtp --field=versionVerify Fix Applied:
Confirm plugin version is 2.5.7 or higher in WordPress admin📡 Detection & Monitoring
Log Indicators:
- Multiple email resend requests from same user session
- Unusual AJAX requests to post-smtp endpoints
Network Indicators:
- POST requests to /wp-admin/admin-ajax.php with action=post_smtp_* parameters
SIEM Query:
source="wordpress" AND uri="/wp-admin/admin-ajax.php" AND action="post_smtp_*"