WordPressプラグイン「Rank Math SEO PRO」に脆弱性（CVE-2026-111862）
概要
WordPressプラグイン「Rank Math SEO PRO」に脆弱性が確認されました。
バージョン 3.0.123 以上 3.0.123 以下に影響があります。
修正版 3.0.124 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-111862 WF-81cd7a2c-ad0c-4dbc-b5dc-07ec866d5c1f |
|---|---|
| 脆弱性の種類 | CWE-506 |
| 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10月16日 |
| 更新日 | 2026年10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「Rank Math SEO PRO」 |
3.0.123 以上 3.0.123 以下 | 3.0.124 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Rank Math SEO PRO」を修正版 3.0.124 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
Rank Math SEO PRO 3.0.123 - Unauthenticated Embedded Malicious Code
Rank Math SEO PRO for WordPress is affected by a supply-chain compromise in a subset of version 3.0.123 packages downloaded or updated between October 15, 2026 at 20:02 UTC and October 16, 2026 at 07:12 UTC. Rank Math states that the affected plugin files contained malware that could compromise a website if the plugin was activated and directs sites that activated an affected package to treat the website as compromised. The malware may establish persistent access, communicate with rank1cdn[.]com, recreate hidden backdoors on page visits, and expose WordPress credentials, database credentials, API keys, and other secrets accessible to the web server. Rank Math identifies three malicious wp_options keys, hidden PHP backdoors, unauthorized administrator accounts, a fake WordPress core file, PHP-executable .cache files, and a system cron marker as incident indicators. Only packages obtained during the vendor-confirmed window are claimed as affected; version 3.0.123 alone is not sufficient to establish compromise. Rank Math removed the affected files and released version 3.0.124 as the clean replacement.
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