CVE-2025-26841
📋 TL;DR
A Cross-Site Scripting (XSS) vulnerability in Everest Forms WordPress plugin before version 3.0.9 allows attackers to execute arbitrary JavaScript code via file upload functionality. This affects WordPress sites using vulnerable versions of Everest Forms, potentially compromising user sessions and site integrity.
💻 Affected Systems
- WPEVEREST Everest Forms WordPress Plugin
📦 What is this software?
Everest Forms by Wpeverest
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains administrative access, defaces website, steals sensitive data, or installs backdoors through malicious JavaScript execution.
Likely Case
Session hijacking, credential theft, or content injection affecting users who interact with malicious file uploads.
If Mitigated
Limited to isolated user interface manipulation without data compromise if proper input validation and output encoding are implemented.
🎯 Exploit Status
Exploitation requires user interaction with malicious file uploads; proof-of-concept details are publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.9
Vendor Advisory: https://everestforms.net
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 is 3.0.9 or later.
🔧 Temporary Workarounds
Disable File Uploads
allTemporarily disable file upload functionality in Everest Forms settings.
Input Validation Filter
allImplement custom WordPress filter to sanitize file upload inputs.
add_filter('everest_forms_file_upload_validation', 'custom_sanitize_function');
🧯 If You Can't Patch
- Restrict file upload permissions to trusted users only.
- Implement web application firewall (WAF) rules to block XSS payloads in file uploads.
🔍 How to Verify
Check if Vulnerable:
Check Everest Forms plugin version in WordPress admin under Plugins > Installed Plugins.Check Version:
wp plugin list --name=everest-forms --field=versionVerify Fix Applied:
Confirm version is 3.0.9 or higher and test file upload functionality with XSS payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads with JavaScript content
- Multiple failed upload attempts with suspicious filenames
Network Indicators:
- HTTP POST requests to /wp-admin/admin-ajax.php with file upload parameters containing script tags
SIEM Query:
source="wordpress.log" AND "everest-forms" AND "upload" AND ("<script>" OR "javascript:")