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-2026-3853）
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-2026-3853 WF-d5de8f35-266f-45ce-8678-e52a33036b30 |
|---|---|
| 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4日 |
| 更新日 | 2026年9月5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+) DOM-Based Stored Cross-Site Scripting via Video Slider 'image_src' Shortcode Parameter
The Divi theme for WordPress is vulnerable to DOM-Based Stored Cross-Site Scripting via the `image_src` attribute of the `et_pb_video_slider_item` shortcode in all versions up to, and including, 4.27.6. This is due to the `image_src` field not being included in the `$url_options` whitelist (which only contains `url`, `button_link`, `button_url`), so it never receives `esc_url_raw()` at save time. On the server side, the value is rendered into a `data-image` HTML attribute using `esc_attr()`, which encodes double quotes as `"`. However, the client-side JavaScript carousel code in `custom.unified.js` reads this attribute using jQuery's `.data('image')`, which returns the browser-decoded value (with `"` decoded back to `"`). The decoded value is then concatenated directly into an HTML string and injected into the DOM via `jQuery.after()` without re-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 hovers over the carousel thumbnail.
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