The Welcomizer <= 2.8.1 - Missing Authorization to Authenticated (Subscriber+) Remote Code Execution via 'twiz_custom_logic' Parameter

Wordfence Intelligence   >   Vulnerability Database   >   The Welcomizer <= 2.8.1 - Missing Authorization to Authenticated (Subscriber+) Remote Code Execution via 'twiz_custom_logic' Parameter
8.8
Improper Control of Generation of Code ('Code Injection')
CVE CVE-2026-4327
CVSS 8.8 (High)
Publicly Published September 18, 2026
Last Updated September 19, 2026
Researcher Nabil Irawan - Heroes Cyber Security

Description

The The Welcomizer plugin for WordPress is vulnerable to Remote Code Execution in all versions up to and including 2.8.1. This is due to missing authorization checks on the twiz_ajax_callback AJAX action's 'savesection' handler combined with the use of eval() to execute user-supplied 'custom logic' code on the frontend. The AJAX handler at twiz-ajax.php verifies a nonce but performs no current_user_can() capability check for the ACTION_SAVE_SECTION case. Furthermore, the nonce is exposed to any authenticated user through the directly-accessible twiz-ajax.js.php file which loads WordPress and outputs the nonce. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary PHP code via the twiz_custom_logic POST parameter when saving a section with output choice 'twiz_logic_output'.

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Vulnerability Details for The Welcomizer

The Welcomizer

Software Type Plugin
Software Slug the-welcomizer (view on wordpress.org)
Patched? Yes
Remediation Update to version 999.0, or a newer patched version
Affected Version
  • <= 2.8.1
Patched Version
  • 999.0

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