WordPressプラグイン「Kirki – Freeform Page Builder, Website Builder & Customizer」にクロスサイトスクリプティング（XSS）の脆弱性（CVE-2026-102173）
概要
WordPressプラグイン「Kirki – Freeform Page Builder, Website Builder & Customizer」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 6.3.1 以前に影響があります。
修正版 6.3.2 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-102173 WF-368001e9-3806-41d5-902e-0facf7fb31ff |
|---|---|
| 脆弱性の種類 | クロスサイトスクリプティング（XSS） |
| 危険度 | 高 |
| CVSSスコア |
7.2（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| 公開日 | 2026年10月6日 |
| 更新日 | 2026年10月7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「Kirki – Freeform Page Builder, Website Builder & Customizer」 |
6.3.1 以前 | 6.3.2 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Kirki – Freeform Page Builder, Website Builder & Customizer」を修正版 6.3.2 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
Kirki – Freeform Page Builder, Website Builder & Customizer <= 6.3.1 - Unauthenticated Stored Cross-Site Scripting via Registration Metadata
The Kirki – Freeform Page Builder, Website Builder & Customizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via registration metadata in all versions up to, and including, 6.3.1 This is due to insufficient escaping in `ExceptionalElements::image_element()`, which concatenates a user-meta value straight into an `<img src="…">` attribute. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute whenever a user accesses a page rendering a Kirki users collection whose image element is bound to one of the nine registration meta fields. Requires public user registration to be enabled and a published page carrying a `kirki-register` element, which prints the required element nonce into the public markup.
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