CVE-2024-13346: Avada WordPress Theme RCE Vulnerability

CVE-2024-13346 Overview

CVE-2024-13346 is a critical arbitrary shortcode execution vulnerability affecting the Avada Website Builder theme for WordPress and WooCommerce. The vulnerability exists in all versions up to and including 7.11.13 due to improper validation of user-supplied input before passing it to the do_shortcode function. This allows unauthenticated attackers to execute arbitrary shortcodes on vulnerable WordPress installations.

Critical Impact

Unauthenticated attackers can remotely execute arbitrary shortcodes, potentially leading to complete site compromise, data exfiltration, or malicious code execution on affected WordPress installations.

Affected Products

• Theme-fusion Avada versions up to and including 7.11.13
• WordPress installations running vulnerable Avada theme versions
• WooCommerce sites using vulnerable Avada theme versions

Discovery Timeline

• 2025-02-13 - CVE-2024-13346 published to NVD
• 2025-02-24 - Last updated in NVD database

Technical Details for CVE-2024-13346

Vulnerability Analysis

This vulnerability is classified as Code Injection (CWE-94), specifically targeting WordPress's shortcode execution mechanism. The Avada theme fails to properly validate user-controlled input before passing it to the WordPress do_shortcode() function. This function is designed to process shortcode tags embedded in content, but when user input is passed directly without sanitization, attackers can inject and execute arbitrary shortcodes.

WordPress shortcodes can perform a wide range of actions depending on installed plugins and theme functionality, including database queries, file operations, and external requests. The unauthenticated nature of this vulnerability significantly increases its severity, as no user credentials are required to exploit it.

Root Cause

The root cause lies in insufficient input validation within the Avada theme's action handling code. When processing user requests, the application accepts input that is subsequently passed to do_shortcode() without proper sanitization or whitelisting. This allows attackers to craft malicious requests containing arbitrary shortcode syntax that the WordPress core will then execute with the privileges of the web application.

Attack Vector

The vulnerability is exploitable over the network without authentication. An attacker can send specially crafted HTTP requests to vulnerable WordPress installations running the Avada theme. The attack requires no user interaction and can be automated at scale against exposed WordPress sites.

The exploitation flow typically involves:

1. Attacker identifies a WordPress site running a vulnerable version of the Avada theme
2. Attacker crafts a malicious request containing shortcode injection payload
3. The vulnerable action handler passes the unvalidated input to do_shortcode()
4. WordPress executes the injected shortcode with application privileges
5. Depending on available shortcodes and plugins, the attacker can achieve various malicious outcomes including data theft, site defacement, or persistent backdoor installation

For detailed technical analysis and proof-of-concept information, refer to the Wordfence Vulnerability Report.

Detection Methods for CVE-2024-13346

Indicators of Compromise

• Unusual HTTP requests containing shortcode syntax (brackets with text patterns like [shortcode_name]) in unexpected parameters
• Web server logs showing requests with encoded bracket characters (%5B, %5D) in POST or GET data targeting Avada theme endpoints
• Unexpected database modifications or new user accounts created without administrator action
• Suspicious outbound connections from the web server to unknown external hosts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block requests containing shortcode patterns in user input fields
• Monitor WordPress access logs for anomalous request patterns targeting theme-specific endpoints
• Deploy file integrity monitoring to detect unauthorized modifications to WordPress core, theme, or plugin files
• Review WordPress user accounts and permissions for unauthorized changes

Monitoring Recommendations

• Enable verbose logging on WordPress installations to capture detailed request information
• Configure real-time alerting for suspicious activity patterns associated with shortcode injection attempts
• Regularly audit installed shortcodes and their capabilities to understand potential attack surface
• Monitor for unexpected plugin installations or theme modifications that could indicate post-exploitation activity

How to Mitigate CVE-2024-13346

Immediate Actions Required

• Update the Avada theme to version 7.11.14 or later immediately
• Review WordPress access logs for signs of exploitation attempts
• Audit WordPress user accounts and remove any unauthorized entries
• Consider temporarily disabling the Avada theme if immediate patching is not possible

Patch Information

Theme-fusion has addressed this vulnerability in Avada theme versions newer than 7.11.13. Administrators should update to the latest available version through the WordPress admin dashboard or by manually downloading the patched version from the official Avada website. The changelog documenting this fix is available at the Avada Change Log.

Workarounds

• Implement a Web Application Firewall (WAF) with rules to block requests containing shortcode syntax in user-controllable parameters
• Restrict access to WordPress admin and sensitive endpoints using IP whitelisting or additional authentication layers
• Disable any unused shortcodes or plugins that could increase the attack surface if shortcode injection occurs
• Consider placing the site in maintenance mode if the theme cannot be immediately updated and the site is business-critical

# Example: Add IP restriction to wp-admin in .htaccess
<Files wp-login.php>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
</Files>

# Example: Block suspicious shortcode patterns in ModSecurity
SecRule REQUEST_URI|ARGS|ARGS_NAMES "@rx \[[\w\s_-]+\]" \
    "id:100001,phase:2,deny,status:403,msg:'Potential Shortcode Injection Attempt'"