WordPressプラグイン「hCaptcha for WP」に脆弱性（CVE-2026-103347）
概要
WordPressプラグイン「hCaptcha for WP」に脆弱性が確認されました。
バージョン 5.3.0 以前に影響があります。
修正版 5.4.0 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-103347 WF-dd3aa31d-58ba-4634-b0e2-b2b4339cb191 |
|---|---|
| 脆弱性の種類 | CWE-804 |
| 危険度 | 高 |
| CVSSスコア |
7.3（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
| 公開日 | 2026年10月1日 |
| 更新日 | 2026年10月9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「hCaptcha for WP」 |
5.3.0 以前 | 5.4.0 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「hCaptcha for WP」を修正版 5.4.0 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
hCaptcha for WP <= 5.3.0 - Unauthenticated Captcha Verification Bypass
The hCaptcha for WP plugin for WordPress is vulnerable to Bypass Vulnerability in all versions up to, and including, 5.3.0. This is due to form action registrations stored exclusively in a WordPress transient that could expire or be evicted, causing get_registered_form() to return null and skip the hCaptcha requirement for auto-verified forms. This makes it possible for unauthenticated attackers to bypass hCaptcha verification on auto-verified forms by waiting for or triggering transient expiration, causing the plugin to skip the captcha check entirely. The site must use AutoVerify (auto-detected hCaptcha integration) for at least one form.
Copyright 2012-2026 Defiant Inc.
Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.
Copyright 1999-2026 The MITRE Corporation
CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.