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-2026-3852）
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-2026-3852 WF-bfc5d53b-272a-4b66-8460-2134087535eb |
|---|---|
| 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2日 |
| 更新日 | 2026年9月3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 Social Media Follow 'skype_url' Shortcode Parameter
The Divi theme for WordPress is vulnerable to Stored Cross-Site Scripting via the `skype_url` shortcode attribute of the Social Media Follow module in all versions up to, and including, 4.27.6. This is due to a three-part sanitization failure: (1) the `skype_url` field is not included in the `$url_options` whitelist in `class-et-builder-element.php`, so it never invokes `esc_url_raw()` during shortcode processing, (2) the render code in `SocialMediaFollowItem.php` explicitly skips `esc_url()` for Skype URLs (`! $is_skype ? esc_url( $url ) : $skype_url`), and (3) only `sanitize_text_field()` is applied, which preserves single and double quote characters allowing attribute breakout. The unsanitized value is interpolated directly into a single-quoted `href` attribute (`href='{$social_network_link_url}'`). 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 interacts with the injected element.
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