CVE-2024-54355
📋 TL;DR
This Cross-Site Request Forgery (CSRF) vulnerability in the WP Mailster WordPress plugin allows attackers to trick authenticated administrators into performing unintended actions. It affects all WP Mailster installations from unknown versions through 1.8.17.0. Attackers could modify plugin settings or perform other administrative actions without the victim's knowledge.
💻 Affected Systems
- WP Mailster WordPress Plugin
📦 What is this software?
Wp Mailster by Wpmailster
⚠️ Risk & Real-World Impact
Worst Case
Attackers could reconfigure the email plugin to intercept or redirect all emails, potentially exposing sensitive communications or enabling further attacks through email-based phishing.
Likely Case
Attackers modify plugin settings to disrupt email functionality or change configuration to less secure settings, causing operational impact.
If Mitigated
With proper CSRF protections and user awareness, the risk is minimal as it requires user interaction and authentication.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated administrators into clicking malicious links. No authentication bypass is needed as the attack relies on the victim's existing session.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.8.18.0 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find WP Mailster and click 'Update Now' if available. 4. Alternatively, download version 1.8.18.0+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Implement CSRF Protection Headers
allAdd Content Security Policy headers to restrict cross-origin requests
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval';"
Add to nginx config: add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval';";
Temporary Plugin Deactivation
linuxDisable WP Mailster plugin until patched
wp plugin deactivate wp-mailster
🧯 If You Can't Patch
- Implement strict SameSite cookie policies for WordPress admin sessions
- Educate administrators about CSRF risks and safe browsing practices
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for WP Mailster version. If version is 1.8.17.0 or earlier, you are vulnerable.Check Version:
wp plugin get wp-mailster --field=versionVerify Fix Applied:
Verify WP Mailster version is 1.8.18.0 or later in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual plugin configuration changes in WordPress logs
- Multiple failed CSRF token validations for WP Mailster endpoints
Network Indicators:
- Unexpected POST requests to /wp-admin/admin-ajax.php with wp-mailster actions from external referrers
SIEM Query:
source="wordpress.log" AND "wp-mailster" AND ("action=" OR "settings") AND referer NOT CONTAINS "your-domain.com"