WordPressプラグイン「User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder」にコードインジェクションの脆弱性（CVE-2026-92798）
概要
WordPressプラグイン「User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder」にコードインジェクションの脆弱性が確認されました。
バージョン 5.2.8 以前に影響があります。
修正版 5.3.0 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-92798 WF-ec317df9-c7ef-49a3-9818-903dfe4bdd03 |
|---|---|
| 脆弱性の種類 | コードインジェクション |
| 危険度 | 高 |
| CVSSスコア |
8.1（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| 公開日 | 2026年10月16日 |
| 更新日 | 2026年10月17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「User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder」 |
5.2.8 以前 | 5.3.0 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder」を修正版 5.3.0 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
User Registration & Membership <= 5.2.8 - Authenticated (Subscriber+) Arbitrary Shortcode Execution via Referer Header via 'referrer_url' Smart Tag
The User Registration & Membership plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 5.2.8 This is due to insufficient input sanitization in the 'referrer_url' branch of UR_Smart_Tags::process(), where the attacker-controlled HTTP_REFERER header is only passed through sanitize_text_field() — which does not strip WordPress shortcode delimiters — before being substituted into a Content Restriction message that is subsequently executed via apply_shortcodes()/do_shortcode(). This makes it possible for unauthenticated attackers to execute arbitrary registered shortcodes on any restricted page whose message uses the supported {{referrer_url}} smart tag.
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