CVE-2026-28135: Royal Elementor Addons Auth Bypass Flaw

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

bash

# 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>