WordPressプラグイン「s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions」にクロスサイトスクリプティング（XSS）の脆弱性（CVE-2026-109972）
概要
WordPressプラグイン「s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions」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 261011 以前に影響があります。
修正版 261017 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-109972 WF-2782f0f7-625d-4141-8e2c-4bdaa0219007 |
|---|---|
| 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10月27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「s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions」 |
261011 以前 | 261017 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions」を修正版 261017 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
s2Member <= 261011 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'date_format' Shortcode Attribute
The s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'date_format' parameter in all versions up to, and including, <= 261011 due to insufficient input sanitization and output 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 accesses an injected page. The payload bypasses wp_kses_post() on save because it contains no literal angle brackets — only backslash-escaped sequences that PHP's date() materializes into HTML tag characters at render time after WordPress's shortcode_parse_atts() applies stripcslashes() to the attribute value.
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