CVE-2024-8542
📋 TL;DR
The Everest Forms WordPress plugin before version 3.0.3.1 contains a stored cross-site scripting (XSS) vulnerability in its settings. This allows authenticated administrators to inject malicious scripts that execute when other users view affected pages, even in WordPress multisite configurations where unfiltered_html is restricted. Only WordPress sites using vulnerable Everest Forms versions are affected.
💻 Affected Systems
- Everest Forms WordPress Plugin
📦 What is this software?
Everest Forms by Wpeverest
⚠️ Risk & Real-World Impact
Worst Case
An attacker with admin privileges could inject malicious JavaScript that steals session cookies, redirects users to phishing sites, or performs actions on behalf of authenticated users, potentially leading to complete site compromise.
Likely Case
Malicious admin or compromised admin account injects tracking scripts, defaces content, or steals limited user data through XSS payloads in plugin settings.
If Mitigated
With proper access controls and admin account security, impact is limited to potential defacement or nuisance scripts affecting plugin settings pages only.
🎯 Exploit Status
Exploitation requires admin privileges. Attack involves injecting JavaScript into plugin settings fields that lack proper sanitization.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.3.1
Vendor Advisory: https://wpscan.com/vulnerability/e5f94dcf-a6dc-4c4c-acb6-1a7ead701053/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Everest Forms and click 'Update Now'. 4. Verify version shows 3.0.3.1 or higher.
🔧 Temporary Workarounds
Remove Admin Access from Untrusted Users
allLimit admin privileges to trusted personnel only to prevent exploitation.
Disable Everest Forms Plugin
linuxTemporarily disable the plugin until patching is possible.
wp plugin deactivate everest-forms
🧯 If You Can't Patch
- Restrict admin account access to only essential personnel and implement strong authentication.
- Implement web application firewall (WAF) rules to block XSS payloads in plugin settings requests.
🔍 How to Verify
Check if Vulnerable:
Check Everest Forms plugin version in WordPress admin under Plugins > Installed Plugins. If version is below 3.0.3.1, the system is vulnerable.Check Version:
wp plugin get everest-forms --field=versionVerify Fix Applied:
Confirm Everest Forms version is 3.0.3.1 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual modifications to Everest Forms settings by admin users
- POST requests to Everest Forms settings endpoints containing script tags or JavaScript
Network Indicators:
- HTTP requests to /wp-admin/admin.php?page=evf-settings with suspicious payloads
SIEM Query:
source="wordpress" AND (uri_path="/wp-admin/admin.php" AND query="page=evf-settings") AND (body CONTAINS "<script>" OR body CONTAINS "javascript:")