WordPressプラグイン「Noptin – Newsletter, New Post Notifications & Email Automation」にクロスサイトスクリプティング（XSS）の脆弱性（CVE-2026-103482）
概要
WordPressプラグイン「Noptin – Newsletter, New Post Notifications & Email Automation」にクロスサイトスクリプティング（XSS）の脆弱性が確認されました。
バージョン 4.3.10 以前に影響があります。
修正版 4.4.0 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-103482 WF-e5f8afa3-f20c-4dfb-bcc6-2682f68723ca |
|---|---|
| 脆弱性の種類 | クロスサイトスクリプティング（XSS） |
| 危険度 | 中 |
| CVSSスコア |
5.4（CVSS v3.1） CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N |
| 公開日 | 2026年10月9日 |
| 更新日 | 2026年10月10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「Noptin – Newsletter, New Post Notifications & Email Automation」 |
4.3.10 以前 | 4.4.0 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Noptin – Newsletter, New Post Notifications & Email Automation」を修正版 4.4.0 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
Simple Newsletter Plugin <= 4.3.10 - Unauthenticated Stored Cross-Site Scripting via Subscriber Custom Field via Manage Preferences Form + Campaign Preview noptin_key Pivot
The Simple Newsletter Plugin – Noptin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'noptin_fields[<custom_field_merge_tag>] (e.g. first_name)' parameter in all versions up to, and including, 4.3.10 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The attack chain requires a published campaign post whose body contains a [[subscriber.*]] merge tag; the unauthenticated attacker first POSTs the entity-encoded payload to the public manage_preferences form (which issues its own nonce on the same page), then pivots execution by embedding their confirm_key in a campaign preview URL sent to a privileged user via social engineering.
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