sebwordpress The Welcomizer Plugin up to 2.8.1 on WordPress Savesection twiz-ajax.php twiz_ajax_callback twiz_custom_logic improper authorization

Summaryinfo

A vulnerability described as critical has been identified in sebwordpress The Welcomizer Plugin up to 2.8.1. This affects the function twiz_ajax_callback of the file twiz-ajax.php of the component Savesection Handler. Such manipulation of the argument twiz_custom_logic leads to improper authorization. This vulnerability is listed as CVE-2026-4327. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in sebwordpress The Welcomizer Plugin up to 2.8.1. It has been rated as critical. Affected by this issue is the function twiz_ajax_callback of the file twiz-ajax.php of the component Savesection Handler. The manipulation of the argument twiz_custom_logic with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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'.

The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-4327 since 03/17/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/19/2026). The MITRE ATT&CK project declares the attack technique as T1548.002.

By approaching the search of inurl:twiz-ajax.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• WordPress Plugin

Vendor

• sebwordpress

Name

• The Welcomizer Plugin

Version

• 2.8.0
• 2.8.1

CPE 2.3info

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• 🔒

CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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