CVE-2026-3311: Plus Addons for Elementor XSS Vulnerability

CVE-2026-3311 Overview

The Plus Addons for Elementor – Addons for Elementor, Page Templates, Widgets, Mega Menu, WooCommerce plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the plugin's Progress Bar shortcode. This security flaw exists in all versions up to and including 6.4.9 due to insufficient input sanitization and output escaping on user-supplied attributes.

This vulnerability allows authenticated attackers with contributor-level access or higher to inject arbitrary web scripts into WordPress pages. The malicious scripts execute whenever any user accesses an injected page, potentially enabling session hijacking, credential theft, and website defacement.

Critical Impact

Authenticated attackers can persistently inject malicious JavaScript that executes in visitors' browsers, enabling account compromise, sensitive data theft, and further attacks against site users.

Affected Products

• The Plus Addons for Elementor – Addons for Elementor, Page Templates, Widgets, Mega Menu, WooCommerce plugin for WordPress versions up to and including 6.4.9
• WordPress installations using vulnerable versions of The Plus Addons for Elementor plugin
• Sites where contributors or higher-privileged users have access to the Progress Bar shortcode

Discovery Timeline

• April 8, 2026 - CVE-2026-3311 published to NVD
• April 8, 2026 - Last updated in NVD database

Technical Details for CVE-2026-3311

Vulnerability Analysis

This Stored Cross-Site Scripting vulnerability (CWE-79) exists within the Progress Bar shortcode functionality of The Plus Addons for Elementor plugin. The vulnerability arises from the plugin's failure to properly sanitize and escape user-supplied input when processing shortcode attributes.

When an authenticated user with contributor-level privileges creates or modifies content containing the Progress Bar shortcode, they can inject malicious JavaScript payloads through improperly validated attribute fields. Since the vulnerability is stored rather than reflected, the malicious code persists in the WordPress database and executes every time the affected page is loaded.

The cross-site scripting payload affects all users who view the compromised page, including administrators. This creates a significant risk as attackers can potentially escalate privileges by stealing administrator session cookies or performing actions on their behalf.

Root Cause

The root cause of this vulnerability is insufficient input sanitization and output escaping on user-supplied attributes within the Progress Bar shortcode handler. The plugin fails to properly validate and encode special characters that can be interpreted as HTML or JavaScript code.

Specifically, the shortcode processing logic does not apply appropriate WordPress escaping functions (such as esc_attr(), esc_html(), or wp_kses()) to user-controllable attribute values before rendering them in the page output. This allows attackers to break out of the intended attribute context and inject arbitrary script content.

Attack Vector

The attack requires network access and authentication with at least contributor-level privileges on the target WordPress site. An attacker exploits the vulnerability by:

1. Creating or editing a WordPress post or page using the Elementor editor
2. Adding a Progress Bar element with malicious JavaScript injected into vulnerable attribute fields
3. Publishing or saving the content, storing the payload in the database
4. Waiting for other users, including administrators, to view the page
5. The malicious script executes in the victim's browser context with full access to their session

The vulnerability enables attackers to potentially steal session cookies, redirect users to malicious sites, deface website content, or perform actions as the victim user. Since this is a stored XSS vulnerability, the attack is persistent and does not require social engineering to deliver the payload to victims.

Detection Methods for CVE-2026-3311

Indicators of Compromise

• Unexpected JavaScript code embedded in Progress Bar shortcode attributes within WordPress posts or pages
• Suspicious <script> tags or event handlers (e.g., onerror, onload, onclick) appearing in page content
• Reports from users about unexpected redirects, pop-ups, or behavior when viewing specific pages
• Audit logs showing contributors editing pages with unusual shortcode content

Detection Strategies

• Review WordPress content database for Progress Bar shortcodes containing suspicious JavaScript or HTML injection patterns
• Implement Content Security Policy (CSP) headers to detect and block inline script execution
• Monitor web application firewall (WAF) logs for XSS payload patterns in requests to the WordPress admin area
• Conduct regular security scans using WordPress vulnerability scanners to identify plugin weaknesses

Monitoring Recommendations

• Enable WordPress audit logging to track all content modifications by contributor-level and above users
• Configure browser-based XSS detection through security headers and monitor violations
• Implement real-time alerting for Content Security Policy violations that may indicate exploitation attempts
• Regularly review pages created or modified by users with contributor-level access for suspicious content

How to Mitigate CVE-2026-3311

Immediate Actions Required

• Update The Plus Addons for Elementor plugin to the latest patched version immediately
• Review all existing Progress Bar shortcodes in posts and pages for potentially malicious content
• Audit user accounts with contributor-level access and review their recent content modifications
• Consider temporarily restricting contributor-level users' ability to add Progress Bar elements until the update is applied

Patch Information

The vulnerability has been addressed in a plugin update. The specific changes can be reviewed in the WordPress Plugin Update changeset. Website administrators should update to the latest version of The Plus Addons for Elementor plugin to remediate this vulnerability.

For additional vulnerability details and tracking, refer to the Wordfence Vulnerability Report.

Workarounds

• Restrict contributor-level user permissions and review their need for access to advanced shortcodes
• Implement a Web Application Firewall (WAF) with XSS protection rules to filter malicious input
• Enable Content Security Policy headers to mitigate the impact of successful XSS injection
• Consider using a plugin that enforces additional sanitization on shortcode attributes as a defense-in-depth measure

# WordPress CLI command to update The Plus Addons for Elementor plugin
wp plugin update the-plus-addons-for-elementor-page-builder

# Verify current plugin version after update
wp plugin get the-plus-addons-for-elementor-page-builder --field=version