CVE-2026-2600: ElementsKit Elementor Addons XSS Vulnerability

CVE-2026-2600 Overview

The ElementsKit Elementor Addons and Templates plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) via the ekit_tab_title parameter in the Simple Tab widget. This vulnerability affects all versions up to and including 3.7.9 and stems from insufficient input sanitization and output escaping on user-supplied attributes. Authenticated attackers with contributor-level access or higher can inject arbitrary web scripts into pages that execute whenever a user accesses an injected page.

Critical Impact

Authenticated attackers can inject persistent malicious scripts that execute in the context of other users' browser sessions, potentially leading to session hijacking, credential theft, or site defacement.

Affected Products

• ElementsKit Elementor Addons and Templates plugin for WordPress versions up to and including 3.7.9
• WordPress sites using vulnerable Simple Tab widget functionality
• All WordPress installations with contributor-level or higher user accounts using affected plugin versions

Discovery Timeline

• 2026-04-04 - CVE CVE-2026-2600 published to NVD
• 2026-04-07 - Last updated in NVD database

Technical Details for CVE-2026-2600

Vulnerability Analysis

This Stored Cross-Site Scripting vulnerability exists in the ElementsKit Elementor Addons plugin's Simple Tab widget component. The vulnerability occurs because the ekit_tab_title parameter fails to properly sanitize and escape user-supplied input before rendering it in the page output. When contributors or higher-privileged users create or edit content using the Simple Tab widget, they can insert malicious JavaScript code through the tab title field. This code is stored in the WordPress database and subsequently executed in the browsers of any user who views the affected page.

The attack surface requires authenticated access at the contributor level or above, which limits the initial exploitation vector. However, once malicious scripts are injected, they persist and execute for all subsequent page visitors, including administrators. This can lead to privilege escalation, administrative account compromise, or broader site takeover scenarios.

Root Cause

The root cause of this vulnerability is insufficient input sanitization and output escaping in the tab.php widget handler file. The ekit_tab_title parameter is accepted from user input and rendered directly into HTML output without proper encoding or filtering of potentially dangerous characters and script elements. This violates the security principle of treating all user input as untrusted and properly escaping output based on context.

Attack Vector

An attacker with contributor-level access or above must authenticate to the WordPress installation and access the Elementor page builder interface. By creating or editing a page that includes the Simple Tab widget, the attacker can inject malicious JavaScript code into the ekit_tab_title field. The injection payload bypasses the insufficient input validation and is stored in the database. When any user (including administrators) subsequently views the page containing the compromised widget, the malicious script executes in their browser context.

The attack leverages the network-accessible nature of WordPress websites and requires low complexity to execute once authenticated. The impact includes potential compromise of confidentiality and integrity for affected users, as the attacker can steal session cookies, modify page content, or perform actions on behalf of the victim user.

Detection Methods for CVE-2026-2600

Indicators of Compromise

• Presence of unexpected JavaScript code or HTML entities in Simple Tab widget ekit_tab_title database fields
• Unusual script executions observed in browser developer tools when viewing pages with Simple Tab widgets
• Reports of redirect behaviors or popup windows appearing on pages containing ElementsKit tab content
• Web application firewall logs showing XSS pattern matches in POST requests to Elementor save endpoints

Detection Strategies

• Implement web application firewall rules to detect XSS payloads in requests to WordPress admin endpoints, particularly those involving Elementor widget data
• Enable Content Security Policy (CSP) headers in strict mode to detect and block inline script execution from untrusted sources
• Deploy browser-based security monitoring for anomalous JavaScript execution patterns on WordPress front-end pages
• Review WordPress database tables for suspicious HTML or script content in ElementsKit widget metadata fields

Monitoring Recommendations

• Monitor WordPress admin activity logs for contributor-level users creating or modifying pages with Simple Tab widgets
• Configure real-time alerting for CSP violation reports that may indicate XSS exploitation attempts
• Establish baseline behavior for Elementor widget usage and alert on deviations that may suggest injection attempts
• Review server access logs for patterns of requests targeting ElementsKit widget endpoints with encoded payloads

How to Mitigate CVE-2026-2600

Immediate Actions Required

• Update the ElementsKit Elementor Addons and Templates plugin to a version newer than 3.7.9 that contains the security patch
• Audit existing pages using Simple Tab widgets for signs of injected malicious content
• Review and restrict contributor-level access to only trusted users until patching is complete
• Implement Content Security Policy headers to provide defense-in-depth against XSS exploitation

Patch Information

A security patch addressing this vulnerability is available. The fix involves proper input sanitization and output escaping for the ekit_tab_title parameter in the Simple Tab widget. The specific code changes can be reviewed in the WordPress Plugin Change Log. Additional vulnerability details are documented in the Wordfence Vulnerability Report.

Workarounds

• Temporarily disable the ElementsKit Elementor Addons plugin if immediate patching is not possible
• Remove contributor and author role access to the Elementor page builder until the plugin is updated
• Implement strict Content Security Policy headers that block inline script execution as a defense-in-depth measure
• Deploy a web application firewall with XSS detection rules to filter malicious input at the network edge

# WordPress CLI command to update ElementsKit plugin
wp plugin update elementskit-lite --path=/var/www/html/wordpress

# Verify plugin version after update
wp plugin list --name=elementskit-lite --fields=name,version,update_available