CVE-2026-27421: Royal Elementor Addons XSS Vulnerability

CVE-2026-27421 Overview

CVE-2026-27421 is a stored Cross-Site Scripting (XSS) vulnerability in the WProyal Royal Elementor Addons WordPress plugin. The flaw stems from improper neutralization of input during web page generation [CWE-79]. Attackers with low-privileged authenticated access can inject malicious scripts that persist in plugin-rendered content. When other users render the affected pages, the script executes in their browser context.

The vulnerability affects Royal Elementor Addons versions before 1.7.1053. Exploitation requires user interaction and operates over the network. Successful attacks compromise confidentiality, integrity, and availability across security scopes.

Critical Impact

Authenticated attackers can store JavaScript payloads that execute in administrators' browsers, enabling session theft, content manipulation, and privilege abuse against WordPress sites running vulnerable versions of Royal Elementor Addons.

Affected Products

• WProyal Royal Elementor Addons (WordPress plugin)
• All versions prior to 1.7.1053
• WordPress sites with the plugin installed and active

Discovery Timeline

• 2026-05-07 - CVE-2026-27421 published to NVD
• 2026-05-07 - Last updated in NVD database

Technical Details for CVE-2026-27421

Vulnerability Analysis

The vulnerability is a stored XSS issue classified under [CWE-79]. Royal Elementor Addons accepts user-supplied input through plugin widgets or settings without applying sufficient output encoding or sanitization. The unsanitized input is later rendered as part of HTML responses generated by the plugin.

Because the payload persists in the WordPress database, every visitor who loads the affected page triggers script execution. The CVSS vector indicates a scope change, meaning the injected script can affect resources beyond the vulnerable component, such as administrator sessions and the WordPress dashboard.

Exploitation requires an authenticated account with low privileges, such as a Contributor or Editor role, and victim interaction to render the malicious content. The impact spans confidentiality, integrity, and availability at a limited level.

Root Cause

The root cause is improper neutralization of input during web page generation. The plugin fails to apply WordPress sanitization functions such as wp_kses_post(), esc_attr(), or esc_html() to data submitted through widget fields. The data flows from input handlers into the page rendering layer without contextual escaping.

Attack Vector

An authenticated user submits crafted input containing HTML or JavaScript through a vulnerable plugin widget or configuration field. The payload is stored in the WordPress database. When an administrator or other user views the page that renders the field, the browser parses the injected markup and executes the script.

The attacker can use the executed script to exfiltrate session cookies, perform actions on behalf of the victim through the WordPress REST API, modify site content, or pivot to administrator account takeover. The vulnerability mechanism is described in the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2026-27421

Indicators of Compromise

• Unexpected <script> tags, event handlers (onerror, onload), or javascript: URIs stored within Royal Elementor Addons widget content in wp_posts or wp_postmeta tables.
• Outbound HTTP requests from administrator browser sessions to unfamiliar domains shortly after viewing pages that render the plugin.
• Unauthorized creation of administrator accounts or modification of user roles following an admin visit to an affected page.

Detection Strategies

• Audit the WordPress database for stored payloads using SQL pattern matching against post_content and meta_value columns for script tags and JavaScript event attributes.
• Deploy a Web Application Firewall (WAF) with rules that flag XSS payloads in plugin POST endpoints and admin-ajax requests.
• Review plugin version inventories across managed WordPress sites and flag any installation below 1.7.1053.

Monitoring Recommendations

• Enable WordPress audit logging for plugin configuration changes and content edits performed by Contributor and Editor roles.
• Monitor browser-side telemetry from administrator workstations for anomalous script execution and outbound connections originating from /wp-admin/ pages.
• Alert on changes to administrator account counts, user capabilities, and active plugins.

How to Mitigate CVE-2026-27421

Immediate Actions Required

• Update WProyal Royal Elementor Addons to version 1.7.1053 or later on all WordPress installations.
• Review existing plugin content for stored payloads and remove any injected scripts before returning the site to normal operations.
• Rotate administrator session cookies and reset passwords for accounts that may have visited a compromised page.

Patch Information

The vendor addressed the vulnerability in Royal Elementor Addons version 1.7.1053. Apply the update through the WordPress plugin manager or WP-CLI. Refer to the Patchstack WordPress Vulnerability Report for advisory details.

Workarounds

• Restrict Contributor and Editor account creation and audit existing low-privileged accounts until the patch is applied.
• Deploy WAF rules that block XSS payloads in requests targeting Royal Elementor Addons endpoints.
• Temporarily deactivate the plugin if patching is delayed and the site does not require its functionality.

# Update Royal Elementor Addons via WP-CLI
wp plugin update royal-elementor-addons --version=1.7.1053

# Verify installed version
wp plugin get royal-elementor-addons --field=version

# Search the database for potential stored XSS payloads
wp db query "SELECT ID, post_title FROM wp_posts WHERE post_content REGEXP '<script|onerror=|onload=|javascript:';"