WordPressプラグイン「Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI」にサーバーサイドリクエストフォージェリ（SSRF）の脆弱性（CVE-2026-5096）
概要
WordPressプラグイン「Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI」にサーバーサイドリクエストフォージェリ（SSRF）の脆弱性が確認されました。
バージョン 3.4.4 以前に影響があります。
修正版 3.4.5 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-5096 WF-c5bbf7ed-c154-4153-adbf-59f0f7aa3a18 |
|---|---|
| 脆弱性の種類 | サーバーサイドリクエストフォージェリ（SSRF） |
| 危険度 | 中 |
| CVSSスコア |
5.3（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| 公開日 | 2026年8月27日 |
| 更新日 | 2026年8月28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「Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI」 |
3.4.4 以前 | 3.4.5 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI」を修正版 3.4.5 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
Everest Forms <= 3.4.4 - Unauthenticated Server-Side Request Forgery via Upload Field 'Previous Value'
The Everest Forms plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 3.4.4. This is due to the `load_previous_field_value()` method in `class-evf-form-task.php` accepting arbitrary URL values from `$_POST` data for upload fields without domain restriction, which are then passed to `wp_remote_head()` in the `get_local_file_size()` method of `class-evf-form-fields-upload.php`. This makes it possible for unauthenticated attackers to force the WordPress server to make outbound HTTP HEAD requests to arbitrary URLs by submitting a form with an upload field containing a malicious URL while leaving a required field empty to trigger form re-rendering.
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