WordPressプラグイン「Gravity Forms」に危険なファイルのアップロードの脆弱性（CVE-2026-84434）
概要
WordPressプラグイン「Gravity Forms」に危険なファイルのアップロードの脆弱性が確認されました。
バージョン 3.1.0.4 以前に影響があります。
修正版 3.1.1 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-84434 WF-787e22a9-329b-4e71-bc2a-4f5524fc9356 |
|---|---|
| 脆弱性の種類 | 危険なファイルのアップロード |
| 危険度 | 重大 |
| CVSSスコア |
9.8（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:N/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「Gravity Forms」 |
3.1.0.4 以前 | 3.1.1 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Gravity Forms」を修正版 3.1.1 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
Gravity Forms <= 3.1.0.4 - Unauthenticated Arbitrary File Upload via Hidden File Upload Field
The Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.1.0.4 via the upload_file function. This is due to a mismatch between the field validation pipeline and the file persistence pipeline, where hidden file upload fields bypass extension validation and a rejected file's intact upload state is later passed to upload_file() without re-validation. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. Exploitation requires the targeted form to contain a File Upload field with its Visibility set to 'Hidden'; the vulnerability is reachable by unauthenticated attackers on any publicly accessible form meeting this condition.
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