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

Am I affected?

• Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under The Welcomizer.
• No admin access? Run a passive check of your site. It reads public files only.

What to do

1. Update to version 999.0, or a newer patched version
2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
3. Watch The Welcomizer to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Nabil Irawan.

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'.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

• Advisorywordfence.com

Timeline

1. Sep 18, 2026

   CVE published

   Severity high, CVSS 8.8

2. Nov 13, 2026

   Record last updated