WordPressプラグイン「Divi Membership」に不適切な認証の脆弱性（CVE-2026-19660）
概要
WordPressプラグイン「Divi Membership」に不適切な認証の脆弱性が確認されました。
バージョン 2.3.0 以前に影響があります。
修正版 3.0.0 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-19660 WF-3d650cda-341f-4772-9b67-1bac200e3fb7 |
|---|---|
| 脆弱性の種類 | 不適切な認証 |
| 危険度 | 重大 |
| CVSSスコア |
9.8（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 公開日 | 2026年10月1日 |
| 更新日 | 2026年10月2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「Divi Membership」 |
2.3.0 以前 | 3.0.0 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Divi Membership」を修正版 3.0.0 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
Divi Membership <= 2.3.0 - Unauthenticated Authentication Bypass via 'paypal_param' Parameter
The Divi Membership plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 2.3.0. The `process_paypal_callback` function, hooked to the `init` action, accepts a base64-encoded `paypal_param` GET parameter with no IPN validation, no cryptographic signature check, no ownership verification, and no nonce, allowing it to trust an entirely attacker-controlled user ID value that is passed directly to `wp_set_current_user()` and `wp_set_auth_cookie()`. This makes it possible for unauthenticated attackers to log in as any existing WordPress user — including administrators — by supplying an arbitrary user ID in the `paypal_param` GET parameter, resulting in full site takeover. The vulnerability is further compounded by the fact that the PayPal gateway class is instantiated unconditionally regardless of whether PayPal is enabled or configured, ensuring the vulnerable hook is always registered on every front-end request.
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