WordPressプラグイン「Live Composer – Free WordPress Website Builder」にクロスサイトスクリプティング（XSS）の脆弱性（CVE-2026-16786）
概要
WordPressプラグイン「Live Composer – Free WordPress Website Builder」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 2.1.19 以前に影響があります。
修正版 2.1.20 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-16786 WF-852b1766-8674-44a0-843c-381cd4155a2b |
|---|---|
| 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 |
6.4（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
| 公開日 | 2026年8月31日 |
| 更新日 | 2026年9月1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「Live Composer – Free WordPress Website Builder」 |
2.1.19 以前 | 2.1.20 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Live Composer – Free WordPress Website Builder」を修正版 2.1.20 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
Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via dslc_module_testimonials_output Shortcode
The Live Composer – Free WordPress Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via dslc_module_testimonials_output Shortcode in all versions up to, and including, 2.1.19 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload survives save-time wp_kses_post filtering because KSES treats shortcode delimiters as opaque, and the unescaped fields — including main_heading_title, view_all_link, main_heading_link_title, and main_filter_title_all — are only rendered when do_shortcode() executes at page-view time.
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