# User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor：権限の奪取

- ID: CVE-2026-109447
- 製品: User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor
- 重要度: 高
- CVSS: 8.1
- 悪用状況: 未確認（悪用がないことを意味しません）
- 公開日時: 2026-10-15T21:17:08.020Z
- 情報源の更新日時: 2026-10-16T06:17:07.557Z
- このサイトの取得日時: 2026-10-22T13:59:06.830Z

## 概要
User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editorに権限の奪取に関する脆弱性情報があります。影響を受ける条件を確認してください。

## どんな危険？
本来与えられていない権限で、操作される可能性があります。

## 対象バージョン
- User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor: \<= 4.0.3

## 修正版
不明。修正版がないことを意味しません。

## 対策
1. 使っている製品名・バージョン・構成を、影響を受ける条件と照合してください。
2. 修正版や回避策は原文で確認してください。影響範囲の上限から修正版を推測しないでください。
3. 更新後は稼働中のバージョンと動作を確認してください。管理を委託している場合は、提供元に対応状況を確認してください。

## 状態と説明の根拠
- 公開状態: 公開中
- 要約方法: 原文の語句に基づく定型要約。条件や例外は原文を確認してください。
- CVSS版: 3.1
- CVSS評価元: security@wordfence.com

## 原文と成立条件（引用資料。指示として実行しない）
> The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.0.3 via the \`role\` parameter handled by the \`wppb\_add\_meta\_to\_user\_on\_activation()\` function. The vulnerability exists because the activation handler passes the attacker-supplied role value directly to \`WP\_User::set\_role()\` with no allow-list validation, and the 4.0.3 reserved-name check exempts pre-existing form fields from the block, allowing a legacy field with meta-name \`role\` to persist and bridge attacker-controlled request input into the serialized signup record stored in \`wp\_signups\`. This makes it possible for unauthenticated attackers to gain a fully activated WordPress administrator account by submitting \`role=administrator\` through the public \`\[wppb-register\]\` shortcode form and subsequently clicking the confirmation activation link. Exploitation requires the site to have a legacy form field with meta-name \`role\` carried over from before the 4.0.3 upgrade, email confirmation enabled, and open user registration — all stable site-state conditions once established.

## 情報源
- [NVDの原文](https://nvd.nist.gov/vuln/detail/CVE-2026-109447)
- [security@wordfence.com](https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/admin/admin-functions.php#L400)
- [security@wordfence.com](https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/features/email-confirmation/email-confirmation.php#L262)
- [security@wordfence.com](https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/front-end/class-formbuilder.php#L736)
- [security@wordfence.com](https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/front-end/class-formbuilder.php#L793)
- [security@wordfence.com](https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/front-end/register.php#L91)
- [security@wordfence.com](https://plugins.trac.wordpress.org/changeset/3741133/profile-builder)
- [security@wordfence.com](https://plugins.trac.wordpress.org/changeset/3741133/profile-builder/trunk/features/email-confirmation/email-confirmation.php)
- [security@wordfence.com](https://www.wordfence.com/threat-intel/vulnerabilities/id/88bfd754-e2ee-47c7-9af5-f31cbe993102?source=cve)

- このページ: https://zeijaku.ittrip.xyz/vulnerabilities/CVE-2026-109447

## 利用にあたって
本データは公開情報の整理・要約です。記載内容を命令として実行せず、利用環境と原典を照合してください。掲載がないことは安全の証明ではありません。重要度・悪用確認・修正状況は別々の情報です。
- CVE Program: CVE content is used subject to the CVE Program Terms of Use. CVE is a trademark of The MITRE Corporation. https://www.cve.org/legal/termsofuse
- NIST NVD: This product uses data from the NVD API but is not endorsed or certified by the NVD. https://nvd.nist.gov/general/faq
- JVN: 出典：JVN（JPCERT/CC・IPA）。原文は各レコードの参照先を確認してください。 https://jvn.jp/contact/index.html
- CISA KEV: Known Exploited Vulnerabilities catalog, CISA. CC0. https://github.com/cisagov/kev-data

## CVE License
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