WordPressプラグイン「Flying Scripts: Delay JavaScript to Improve Site Speed & Performance」にクロスサイトスクリプティング（XSS）の脆弱性（CVE-2026-109990）
概要
WordPressプラグイン「Flying Scripts: Delay JavaScript to Improve Site Speed & Performance」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 1.2.4 以前に影響があります。
修正版 1.2.5 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-109990 WF-0ddc518c-02a0-46a5-93e9-0d92a045b35b |
|---|---|
| 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15日 |
| 更新日 | 2026年10月16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「Flying Scripts: Delay JavaScript to Improve Site Speed & Performance」 |
1.2.4 以前 | 1.2.5 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Flying Scripts: Delay JavaScript to Improve Site Speed & Performance」を修正版 1.2.5 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
Flying Scripts: Delay JavaScript to Improve Site Speed & Performance <= 1.2.4 - Unauthenticated Stored Cross-Site Scripting via Comment Content
The Flying Scripts: Delay JavaScript to Improve Site Speed & Performance plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 1.2.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit bypasses WordPress core's save-time kses sanitization entirely because the payload uses only kses-allowed elements — an <abbr title> attribute and <code> text content — and the XSS is introduced post-save when the plugin's output-buffer rewriter substitutes a double-quote-bearing <code> body into the <abbr title> attribute via predictable, unsalted ___noise___ placeholder keys.
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