WordPressテーマ「Divi」にクロスサイトスクリプティング（XSS）の脆弱性（CVE-2026-3851）
概要
WordPressテーマ「Divi」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 4.27.6 以前に影響があります。
修正版 4.27.7 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-3851 WF-9384d32d-77a1-4794-aace-96f553302a3b |
|---|---|
| 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9月1日 |
| 更新日 | 2026年9月2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テーマ「Divi」 |
4.27.6 以前 | 4.27.7 | Wordfence Intelligence |
推奨対応
- WordPressテーマ「Divi」を修正版 4.27.7 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
Divi <= 4.27.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via Dynamic Content (Legacy JSON Format) Shortcode
The Divi theme for WordPress is vulnerable to Stored Cross-Site Scripting via the Dynamic Content feature's legacy JSON format in all versions up to, and including, 4.27.6. This is due to two compounding flaws: (1) the save-time sanitization filter `et_builder_sanitize_dynamic_content_fields()` only searches for dynamic content markers in the `@ET-DC@...@` format, but the rendering engine also supports a legacy JSON format that is silently converted at render time, completely bypassing the save-time filter, and (2) the `post_meta_key` resolver in `et_builder_filter_resolve_default_dynamic_content()` does not apply `wp_kses_post()` to the resolved meta value when `enable_html` is set to `on`, passing raw `get_post_meta()` output directly to the page. 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.
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