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CVE-2026-4327— The Welcomizer <= 2.8.1 - Missing Authorization to Authenticated (Subscriber+) Remote Code Execution via 'twiz_custom_logic' Parameter

Quick assessment

Affected
sebwordpress The Welcomizer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 Welcomizer 插件在所有版本（包括 2.8.1 及之前）中存在远程代码执行漏洞。该漏洞源于 AJAX 操作中 'savesection' 处理器缺少授权检查，并结合了使用 函数在前端执行用户提供的“自定义逻辑”代码。 具体而言， 中的 AJAX 处理器虽然验证了 nonce（一次性令牌），但在 情况下未进行 权限检查。此外，nonce 通过可直接访问的 文件暴露给任何已认证用户，该文件会加载 WordPress 并输出 nonce。 这使得具有“订阅者”（Subscriber）级别或

CVSS 8.8 · High
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I. Basic Information for CVE-2026-4327

Vulnerability Information
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Vulnerability Title
The Welcomizer <= 2.8.1 - Missing Authorization to Authenticated (Subscriber+) Remote Code Execution via 'twiz_custom_logic' Parameter
Source: CVE Program / CVE List V5
Vulnerability 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'.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sebwordpress The Welcomizer 0 ~ 2.8.1 -

II. Public POCs for CVE-2026-4327

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III. Intelligence Information for CVE-2026-4327

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Vendor Pages for CVE-2026-4327 (6)

Other References for CVE-2026-4327 (1)

Other References for CVE-2026-4327 (4)

IV. Related Vulnerabilities

Same weakness: CWE-94

V. Comments for CVE-2026-4327

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