WordPressプラグイン「Mailgun for WordPress」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-2026-78003）
概要
WordPressプラグイン「Mailgun for WordPress」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 2.2.0 以前に影響があります。
修正版 2.2.1 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-78003 WF-110e888d-69fc-4682-b908-2b62288c5227 |
|---|---|
| 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 | 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8月21日 |
| 更新日 | 2026年8月22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「Mailgun for WordPress」 |
2.2.0 以前 | 2.2.1 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Mailgun for WordPress」を修正版 2.2.1 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
Mailgun for WordPress <= 2.2.0 - Unauthenticated Server-Side Request Forgery (SSRF) via 'addresses' Array Keys
The Mailgun for WordPress plugin for WordPress is vulnerable to Server-Side Request Forgery (SSRF) via path traversal in versions up to and including 2.2.0. This is due to insufficient input validation in the add_list() function, which accepts user-controlled array keys from $_POST['addresses'], passes them through sanitize_text_field(). This makes it possible for unauthenticated attackers to make authenticated POST requests to any Mailgun API endpoint using the WordPress site's API key, including creating inbound email-forwarding routes that can intercept password reset emails, leading to administrator account takeover.
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