WordPressプラグイン「MetForm – Contact Form, Survey, Quiz, Conditional Forms, Form Templates & Custom Form Builder for Elementor」にインジェクションの脆弱性（CVE-2026-86813）
概要
WordPressプラグイン「MetForm – Contact Form, Survey, Quiz, Conditional Forms, Form Templates & Custom Form Builder for Elementor」に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 4.1.9 未満に影響があります。
修正版 4.1.9 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-86813 WF-4dece711-f603-4133-aa15-5bb2bec381b6 |
|---|---|
| 脆弱性の種類 | インジェクション |
| 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:N/I:L/A:N |
| 公開日 | 2026年9月9日 |
| 更新日 | 2026年9月16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「MetForm – Contact Form, Survey, Quiz, Conditional Forms, Form Templates & Custom Form Builder for Elementor」 |
4.1.9 未満 | 4.1.9 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「MetForm – Contact Form, Survey, Quiz, Conditional Forms, Form Templates & Custom Form Builder for Elementor」を修正版 4.1.9 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
MetForm – Contact Form, Survey, Quiz, Conditional Forms, Form Templates & Custom Form Builder for Elementor < 4.1.9 - Unauthenticated Email Header Injection
The MetForm – Contact Form, Survey, Quiz, Conditional Forms, Form Templates & Custom Form Builder for Elementor plugin for WordPress is vulnerable to email header injection in all versions up to 4.1.9 (exclusive). This makes it possible for unauthenticated attackers to inject additional email headers that can used to perform actions like sending emails to unintended recipients.
Copyright 2012-2026 Defiant Inc.
Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.
Copyright 1999-2026 The MITRE Corporation
CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.