CVE-2026-4327
The Welcomizer <= 2.8.1 - Missing Authorization to Authenticated (Subscriber+) Remote Code Execution via 'twiz_custom_logic' Parameter
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'.
INFO
Published Date :
Sept. 19, 2026, 8:16 a.m.
Last Modified :
Sept. 19, 2026, 8:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-4327
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update The Welcomizer plugin to version 2.8.2.
- Remove plugin if update is not possible.
- Disable the plugin's custom logic feature.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-4327.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-4327 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-4327
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-4327 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-4327 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Sep. 19, 2026
Action Type Old Value New Value Added 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'. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-94 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/4xxx/CVE-2026-4327.json">CVE-2026-4327</a> Added Reference https://plugins.trac.wordpress.org/browser/the-welcomizer/tags/2.8.1/includes/twiz.menu.class.php#L265 Added Reference https://plugins.trac.wordpress.org/browser/the-welcomizer/tags/2.8.1/includes/twiz.menu.class.php#L507 Added Reference https://plugins.trac.wordpress.org/browser/the-welcomizer/tags/2.8.1/includes/twiz.menu.class.php#L580 Added Reference https://plugins.trac.wordpress.org/browser/the-welcomizer/tags/2.8.1/includes/twiz.output.class.php#L828 Added Reference https://plugins.trac.wordpress.org/browser/the-welcomizer/tags/2.8.1/twiz-ajax.php#L148 Added Reference https://plugins.trac.wordpress.org/browser/the-welcomizer/trunk/includes/twiz.menu.class.php#L265 Added Reference https://plugins.trac.wordpress.org/browser/the-welcomizer/trunk/includes/twiz.menu.class.php#L507 Added Reference https://plugins.trac.wordpress.org/browser/the-welcomizer/trunk/includes/twiz.menu.class.php#L580 Added Reference https://plugins.trac.wordpress.org/browser/the-welcomizer/trunk/includes/twiz.output.class.php#L828 Added Reference https://plugins.trac.wordpress.org/browser/the-welcomizer/trunk/twiz-ajax.php#L148 Added Reference https://plugins.trac.wordpress.org/log/the-welcomizer/ Added Reference https://www.wordfence.com/threat-intel/vulnerabilities/id/73fb7102-66ff-4309-a98f-bbbfd3ddbba6?source=cve