CVE-2025-8427
📋 TL;DR
This vulnerability allows authenticated WordPress users with Contributor-level access or higher to inject malicious scripts into pages created with the Beaver Builder plugin. When other users view these compromised pages, the scripts execute in their browsers, potentially stealing credentials or performing unauthorized actions. All WordPress sites using Beaver Builder Starter Version up to 2.9.2.1 are affected.
💻 Affected Systems
- Beaver Builder Plugin (Starter Version) for WordPress
📦 What is this software?
Beaver Builder by Fastlinemedia
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, hijack user sessions, redirect users to malicious sites, or deface the website completely.
Likely Case
Attackers inject malicious scripts to steal user cookies, session tokens, or perform actions on behalf of authenticated users.
If Mitigated
With proper user role management and content review processes, impact is limited to potential defacement of specific pages.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of WordPress/Beaver Builder functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 2.9.2.1
Vendor Advisory: https://www.wpbeaverbuilder.com/change-logs/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Beaver Builder plugin. 4. Click 'Update Now' if update available. 5. If no update appears, manually download latest version from WordPress.org and replace plugin files.
🔧 Temporary Workarounds
Restrict User Roles
allTemporarily remove Contributor and Author roles from untrusted users until patch is applied.
Disable Auto-Play Parameter
allIf possible, disable or restrict the auto_play parameter functionality in Beaver Builder settings.
🧯 If You Can't Patch
- Implement strict user role management - only grant Contributor access to trusted users
- Enable WordPress security plugins with XSS protection and implement Content Security Policy headers
🔍 How to Verify
Check if Vulnerable:
Check Beaver Builder plugin version in WordPress admin panel under Plugins → Installed Plugins.Check Version:
wp plugin list --name=beaver-builder-lite-version --field=versionVerify Fix Applied:
Verify plugin version is higher than 2.9.2.1 and test auto_play parameter functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to Beaver Builder endpoints with auto_play parameter containing script tags
- Multiple page edits by Contributor-level users
Network Indicators:
- Outbound connections to suspicious domains from Beaver Builder pages
- Unexpected JavaScript execution in page responses
SIEM Query:
source="wordpress" AND (uri_path="/wp-admin/admin-ajax.php" OR uri_path CONTAINS "beaver-builder") AND (query_string CONTAINS "auto_play" OR post_data CONTAINS "auto_play") AND (query_string CONTAINS "<script>" OR post_data CONTAINS "<script>")