WordPressプラグイン「The Welcomizer」にコードインジェクションの脆弱性（CVE-2026-4327）
概要
WordPressプラグイン「The Welcomizer」にコードインジェクションの脆弱性が確認されました。
バージョン 2.8.1 以前に影響があります。
修正版 999.0 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-4327 WF-73fb7102-66ff-4309-a98f-bbbfd3ddbba6 |
|---|---|
| 脆弱性の種類 | コードインジェクション |
| 危険度 | 高 |
| CVSSスコア |
8.8（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 公開日 | 2026年9月18日 |
| 更新日 | 2026年9月19日 |
影響を受ける製品
| 製品 | 影響を受けるバージョン | 修正版 | 出典 |
|---|---|---|---|
| WordPressプラグイン「The Welcomizer」 |
2.8.1 以前 | 999.0 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「The Welcomizer」を修正版 999.0 またはそれ以降の公式最新版へ更新してください。
情報元の原文
Wordfence Intelligence
The Welcomizer <= 2.8.1 - Missing Authorization to Authenticated (Subscriber+) Remote Code Execution via 'twiz_custom_logic' Parameter
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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