CVE-2022-1329: Elementor Website Builder RCE Vulnerability

CVE-2022-1329 Overview

The Elementor Website Builder plugin for WordPress contains a critical vulnerability that allows unauthorized execution of several AJAX actions due to a missing capability check in the ~/core/app/modules/onboarding/module.php file. This flaw enables attackers to modify site data and upload malicious files, ultimately leading to remote code execution on affected WordPress installations.

Critical Impact

Authenticated attackers can exploit this missing authorization vulnerability to upload malicious files and achieve remote code execution on WordPress sites running vulnerable versions of Elementor, potentially leading to complete site compromise.

Affected Products

• Elementor Website Builder plugin for WordPress versions 3.6.0 to 3.6.2

Discovery Timeline

• 2022-04-19 - CVE-2022-1329 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-1329

Vulnerability Analysis

This vulnerability is classified under CWE-862 (Missing Authorization) and CWE-434 (Unrestricted Upload of File with Dangerous Type). The root issue lies in the onboarding module of the Elementor plugin, which fails to implement proper capability checks before executing sensitive AJAX actions.

The vulnerability affects the Elementor Website Builder plugin, which is one of the most widely installed WordPress plugins with millions of active installations. The missing authorization check allows any authenticated user, regardless of their role (including subscribers with minimal privileges), to access administrative functions that should be restricted to site administrators.

Root Cause

The vulnerability stems from the ~/core/app/modules/onboarding/module.php file, which registers several AJAX handlers without implementing proper WordPress capability checks. In WordPress development, AJAX handlers must verify that the requesting user has appropriate permissions using functions like current_user_can(). The omission of these checks in the affected versions allows low-privileged authenticated users to invoke administrative functionality.

Attack Vector

The attack vector is network-based and requires only low-level authentication. An attacker with any authenticated WordPress account (even a basic subscriber role) can craft malicious AJAX requests to the vulnerable endpoints. The exploitation chain involves:

1. Authenticating to the WordPress site with any valid user credentials
2. Sending crafted AJAX requests to the vulnerable onboarding module endpoints
3. Modifying site configuration data or uploading malicious PHP files
4. Achieving remote code execution through the uploaded malicious files

The exploitation process involves sending specially crafted POST requests to the WordPress AJAX handler (wp-admin/admin-ajax.php) targeting the Elementor onboarding module actions. Because the module lacks proper authorization checks, these requests are processed regardless of the user's actual permissions. Attackers can upload web shells or other malicious PHP files that, once executed, provide complete server-side code execution capabilities. Detailed technical analysis is available in the Wordfence Blog Vulnerability Report.

Detection Methods for CVE-2022-1329

Indicators of Compromise

• Unexpected PHP files in WordPress upload directories or Elementor plugin folders
• Unusual AJAX requests to admin-ajax.php targeting Elementor onboarding actions from low-privileged users
• Modified site settings or configuration changes without administrator authorization
• Web shell artifacts or suspicious PHP files with encoded or obfuscated content

Detection Strategies

• Monitor WordPress AJAX logs for requests to Elementor onboarding module endpoints from non-administrator users
• Implement file integrity monitoring to detect unauthorized file uploads in the WordPress directory structure
• Review authentication logs for patterns of low-privileged users accessing administrative functions
• Scan for known web shell signatures in uploaded files and Elementor directories

Monitoring Recommendations

• Enable comprehensive logging for all WordPress AJAX actions, particularly those related to plugin operations
• Configure alerts for file system changes in the wp-content/plugins/elementor/ directory and upload folders
• Monitor outbound network connections from the web server that may indicate post-exploitation activity
• Implement Web Application Firewall (WAF) rules to detect and block malicious AJAX request patterns

How to Mitigate CVE-2022-1329

Immediate Actions Required

• Update Elementor Website Builder plugin to version 3.6.3 or later immediately
• Audit WordPress user accounts and remove any unnecessary subscriber or contributor accounts
• Perform a full malware scan on the WordPress installation to detect any potential compromises
• Review uploaded files and remove any suspicious PHP files that may have been uploaded during the exploitation window

Patch Information

Elementor has released a security patch addressing this vulnerability. The fix implements proper capability checks in the onboarding module to ensure only authorized administrators can execute the affected AJAX actions. The patch can be reviewed in the WordPress Plugin Change Log. Update to Elementor version 3.6.3 or later through the WordPress admin dashboard or via WP-CLI.

Workarounds

• If immediate patching is not possible, temporarily deactivate the Elementor plugin until the update can be applied
• Restrict WordPress user registration to prevent unauthorized account creation
• Implement additional authentication layers (2FA) for all WordPress user accounts
• Use a Web Application Firewall to filter malicious requests targeting the vulnerable endpoints

# Update Elementor plugin via WP-CLI
wp plugin update elementor

# Verify the installed version
wp plugin get elementor --field=version

# Scan for suspicious files in uploads directory
find /path/to/wordpress/wp-content/uploads -name "*.php" -type f -mtime -30

# Check for modified files in Elementor plugin directory
find /path/to/wordpress/wp-content/plugins/elementor -name "*.php" -type f -mtime -30