WordPressプラグイン「Booking Calendar」に競合状態の脆弱性（CVE-2026-39601）
概要
WordPressプラグイン「Booking Calendar」に競合状態の脆弱性が確認されました。
バージョン 11.8.4 以前に影響があります。
修正版 11.9 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-39601 WF-329a886e-35e0-4c31-b9fe-2a82166e948a |
|---|---|
| 脆弱性の種類 | 競合状態 |
| 危険度 | 中 |
| CVSSスコア |
5.3（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| 公開日 | 2026年10月2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「Booking Calendar」 |
11.8.4 以前 | 11.9 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Booking Calendar」を修正版 11.9 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
Booking Calendar <= 11.8.4 - Unauthenticated Duplicate Slot Booking
The Booking Calendar plugin for WordPress is vulnerable to Race Condition in all versions up to, and including, 11.8.4. This is due to missing real-time date-availability validation at the moment of date selection, allowing a date shown as available during calendar load to be selected and submitted after a concurrent booking had taken it. This makes it possible for unauthenticated attackers to make duplicate bookings for the same resource slot by exploiting the window between calendar availability display and actual booking submission.
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