CVE-2026-28135 Overview
CVE-2026-28135 is an Inclusion of Functionality from Untrusted Control Sphere vulnerability (CWE-829) affecting the WP Royal Royal Elementor Addons plugin for WordPress. This vulnerability allows attackers to access functionality that is not properly constrained by Access Control Lists (ACLs), potentially enabling unauthorized access to restricted plugin features.
Critical Impact
Attackers can bypass access control restrictions in the Royal Elementor Addons plugin, potentially gaining access to administrative functionality or restricted features without proper authorization.
Affected Products
- Royal Elementor Addons plugin versions up to and including 1.7.1049
- WordPress installations running vulnerable versions of the royal-elementor-addons plugin
Discovery Timeline
- 2026-03-05 - CVE-2026-28135 published to NVD
- 2026-03-05 - Last updated in NVD database
Technical Details for CVE-2026-28135
Vulnerability Analysis
This vulnerability stems from the plugin including functionality from an untrusted control sphere, classified under CWE-829. The Royal Elementor Addons plugin fails to properly restrict access to certain functionality through adequate Access Control List (ACL) constraints. This architectural flaw allows attackers to invoke plugin functions or features that should otherwise require elevated privileges or specific authorization checks.
The vulnerability affects the plugin's access control mechanisms, where functionality that should be protected by authorization checks can be accessed by users who lack the appropriate permissions. This type of vulnerability is particularly dangerous in WordPress environments where plugins often handle sensitive operations like content modification, user data access, or site configuration changes.
Root Cause
The root cause lies in improper implementation of access control constraints within the Royal Elementor Addons plugin. The plugin includes functionality that can be invoked from an untrusted control sphere without adequate verification of the requesting user's authorization level. This typically occurs when:
- Plugin endpoints or AJAX handlers fail to verify user capabilities before executing privileged operations
- Functionality is exposed through public-facing interfaces without proper authentication checks
- ACL rules are not consistently applied across all plugin features
Attack Vector
The attack vector for this vulnerability involves accessing plugin functionality that bypasses normal access control restrictions. An attacker can exploit this vulnerability by identifying and invoking plugin functions or endpoints that lack proper ACL enforcement.
The exploitation typically involves:
- Identifying exposed plugin functionality that performs privileged operations
- Crafting requests to access this functionality without proper authorization
- Bypassing ACL checks to execute restricted operations
Since no verified code examples are available for this vulnerability, security researchers should refer to the Patchstack Vulnerability Report for detailed technical analysis and proof-of-concept information.
Detection Methods for CVE-2026-28135
Indicators of Compromise
- Unexpected access to restricted Elementor addon features by non-privileged users
- Anomalous AJAX requests to the royal-elementor-addons plugin endpoints
- Unauthorized modifications to content created with Royal Elementor Addons
- Unusual WordPress user activity patterns involving plugin functionality
Detection Strategies
- Monitor WordPress AJAX handler calls for unauthorized access attempts to Royal Elementor Addons functionality
- Implement web application firewall (WAF) rules to detect and block suspicious requests to the plugin
- Review WordPress access logs for requests to royal-elementor-addons endpoints from unauthenticated or low-privilege sessions
- Enable WordPress audit logging to track plugin functionality usage
Monitoring Recommendations
- Configure real-time alerting for access control violations in WordPress plugins
- Implement log correlation to identify patterns of unauthorized access attempts
- Monitor for bulk requests to plugin endpoints that could indicate automated exploitation
- Review WordPress user capability changes and unexpected privilege modifications
How to Mitigate CVE-2026-28135
Immediate Actions Required
- Update Royal Elementor Addons to a version newer than 1.7.1049 when a patched version becomes available
- Review current user permissions and access to the Royal Elementor Addons plugin
- Implement additional access control measures at the web server or WAF level
- Monitor plugin activity logs for any signs of exploitation
Patch Information
Organizations should monitor for updates from WP Royal for the Royal Elementor Addons plugin. The vulnerability affects all versions through 1.7.1049. Users should update to the latest available version as soon as a security patch is released. For the latest patch information, consult the Patchstack Vulnerability Report.
Workarounds
- Temporarily disable the Royal Elementor Addons plugin until a patch is available if the functionality is not critical
- Implement IP-based access restrictions to the WordPress admin area and plugin functionality
- Deploy a Web Application Firewall (WAF) with rules to filter malicious requests to the plugin
- Restrict user capabilities and roles to minimize the impact of potential exploitation
# WordPress configuration - restrict access to AJAX handlers
# Add to .htaccess for Apache servers
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/wp-admin/admin-ajax.php
RewriteCond %{HTTP_REFERER} !^https://yourdomain.com [NC]
RewriteRule .* - [F,L]
</IfModule>
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
