WordPressプラグイン「WPMU DEV Dashboard」に脆弱性（CVE-2026-76581）
概要
WordPressプラグイン「WPMU DEV Dashboard」に脆弱性が確認されました。
バージョン 5.0.1 以前に影響があります。
修正版 5.0.2 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-76581 WF-3d4321c8-15a4-46f5-9b0e-2098a7fcfb5b |
|---|---|
| 脆弱性の種類 | CWE-347 |
| 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8月27日 |
| 更新日 | 2026年8月28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「WPMU DEV Dashboard」 |
5.0.1 以前 | 5.0.2 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「WPMU DEV Dashboard」を修正版 5.0.2 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
WPMU DEV Dashboard <= 5.0.1 - Authentication Bypass to Administrator via SSO HMAC Canonicalization Confusion
The WPMU DEV Dashboard plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 5.0.1. This is due to inconsistent and ambiguous HMAC message construction between the unauthenticated `wdpsso_step1` and `wdpsso_step2` AJAX actions, where step 1 signs and discloses an unseparated concatenation of the token, state, redirect, and domain values, while step 2 verifies an unseparated concatenation that omits the domain field. This makes it possible for unauthenticated attackers, on sites connected to WPMU DEV with Hub SSO enabled and mapped to an administrator, to obtain a valid HMAC from step 1 and replay it to step 2 by moving the domain value into the redirect field, resulting in an authenticated administrator session.
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