WordPressプラグイン「Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin」にクロスサイトスクリプティング（XSS）の脆弱性（CVE-2026-18547）
概要
WordPressプラグイン「Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin」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 2.12.1 以前に影響があります。
修正版 2.13.0 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-18547 WF-a7961bcc-eae7-40e1-8838-9755c7655500 |
|---|---|
| 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8月24日 |
| 更新日 | 2026年8月25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「Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin」 |
2.12.1 以前 | 2.13.0 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin」を修正版 2.13.0 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
Ultimate Member <= 2.12.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Textarea Profile Field with HTML Support (DOM Gadget via id Attribute)
The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Textarea Profile Field with HTML Support (DOM Gadget via id Attribute) in all versions up to, and including, 2.12.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is possible because the wp_kses 'templates' allowlist permits the id attribute on div elements but does not neutralize unescaped quotes within its value; when pickadate.js concatenates the stored id value into an HTML string via jQuery .html() on profile page load, the smuggled onfocus and autofocus attribute syntax breaks out of attribute context and executes as JavaScript.
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